*93OPINION OF THE COURT
Lincoln Park Subacute and Rehab Center (“Center”) petitioned for review and to set aside the National Labor Relations Board’s (“Board”) application to enforce an order of the Board finding that the Center had violated the National Labor Relations Act (“Act”) by discharging two employees based on their union activities. The Board also ordered the Union to conduct a third union election based on the two violations of the Act. We deny the petition to set aside the Board’s order and grant its enforcement.1
I. BACKGROUND
The Center operates a nursing home in Lincoln Park, New Jersey. Beginning in 1994, various unions have sought to represent the Center’s employees. In 1997, District 1199J National Union of Hospital & Healthcare Employees, AFSCME, AFL-CIO (“Union”) began organizing its own campaign to represent the employees. On June 13, 1997, the Union filed a petition for an election. The results of the election conducted on August 8, 1997 (“August 1997 election”) favored the Union. The Center objected to the August 1997 election. On February 25,1998, the Board set aside the August 1997 election and ordered a second election.
Prior to the second election, the Center terminated the employment of two employees who had actively supported the unionization efforts. In January 1998, the Center discharged David Aldorando, a porter, for failing to completely clean rooms. The Center also terminated Dorothy Baines, a certified nursing assistant, in February 1998 for patient neglect and verbal abuse of a patient’s family member.
On April 19, 1998, the Union conducted a second election, in which the employees voted against the Union. On April 24, 1999, the Union filed objections to the second election and claimed that the Center engaged in unfair labor practices regarding numerous employees, including the termination of Aldorando and Baines.2
Administrative Law Judge Raymond P. Green (“ALJ”) heard testimony on the claims. On July 30,1999, the ALJ entered an order, dismissing the charges pertaining to Baines. However, the ALJ determined that the Center had issued a per se unlawful written warning to Aldorando in August 1997 for his tardiness for work. The ALJ ordered a third election. Both parties filed exceptions with the Board.
On April 26, 2001, the Board remanded the matter back to the ALJ to determine whether the August 1997 warning to Aldorando was unlawful on its face, to consider whether additional disciplinary problems justified Aldorando’s termination and to consider more carefully the evidence concerning Baines’ termination. On July 3, 2001, the ALJ issued his supplemental findings as ordered by the Board. The ALJ found the August 1997 warning unlawful because Aldorando provided advance notice to his supervisor about his working as a union observer. In addition, the ALJ held that the Center failed to establish that Baines would have been ter*94minated for patient neglect and verbal abuse regardless of her alleged union activity. The Board adopted the ALJ’s supplemental decision.
II. DISCUSSION
The Board’s findings of fact are conclusive if they are supported by substantial evidence on the record as a whole. See St. Margaret Mem’l Hosp. v. N.L.R.B., 991 F.2d 1146, 1151-52 (3d Cir.1993). We accept the Board’s factual determinations and reasonable inferences derived from those determinations if they are supported by substantial evidence. See Stardyne, Inc. v. N.L.R.B., 41 F.3d 141, 151 (3d Cir.1994). Substantial evidence is “more than a mere scintilla. It means such relevant evidence as a reasonable mind might accept as adequate to support a conclusion.” Consolidated Edison Co. of New York, Inc. v. N.L.R.B., 305 U.S. 197, 229, 59 S.Ct. 206, 83 L.Ed. 126 (1938). We will affirm the Board’s decision even if we might have reached a different conclusion on de novo review. See Universal Camera Corp. v. N.L.R.B., 340 U.S. 474, 488, 71 S.Ct. 456, 95 L.Ed. 456 (1951).
An employer commits an unfair labor practice when it discriminates “in regard to ... tenure of employment or any term or condition of employment to ... discourage membership in any labor organization.” 29 U.S.C. § 158(a)(3). In determining whether a discharge of employees constitutes an unfair labor practice, the General Counsel bears the initial burden of making a prima facie showing by a preponderance of the evidence that protected conduct was a motivating factor in the employer’s decision to discharge. Once the General Counsel demonstrates a prima facie case, the burden shifts to the employer to demonstrate that it would have taken the same action even in the absence of protected conduct by the employees. See Hunter Douglas, Inc. v. N.L.R.B., 804 F.2d 808, 813 (3d Cir.1986). The Center has acknowledged that both Aldorando and Baines were active supporters of the Union. Thus, the Center contends that it would have taken the same action even if Aldorando and Baines had not been active in the union.
A. Aldorando
The Center argues that substantial evidence does not exist to support the Board’s decision regarding Aldorando because it terminated him for an independent non-discriminatory reason, i.e., his failure to clean rooms. The Board determined that the Center failed to demonstrate that it discharged other employees for comparable conduct. The Center notes that during the hearings Aldorando’s supervisor made a passing remark about another porter that the Center terminated for failing to clean. In addition, the Center argues that Aldorando had other disciplinary problems, including being absent from his assigned floor. However, the Center had not issued any prior warning to Aldorando for this conduct. Not until the period between the ordering of the second election and the second election, did the Center choose to document Aldorando’s allegedly poor performance.
The Center further argues that it did not discriminate against other union supporters. However, an employer cannot disprove its unlawful motive by arguing it chose not to discriminate against other union supporters. See Union-Tribune Publ’g Co. v. N.L.R.B., 1 F.3d 486, 492 n. 3 (7th Cir.1993). The Center has failed to meet its burden of proof that they would have terminated Aldorando but for his union activity. See Systems Mgmt., Inc. v. N.L.R.B., 901 F.2d 297, 306 (3d Cir.1990).
*95B. Baines
The Center also argues that the record is devoid of any evidence to show that it unlawfully terminated Baines. The Center asserts that it proved its affirmative defense that it would have terminated Baines in the absence of her union activities. Justifying its termination of Baines, the Center relies on its finding that Baines committed patient neglect and was disrespectful to a patient’s family member.
The ALJ determined that the Center did not investigate thoroughly the claim of neglect and verbal abuse. Further, the ALJ explained that Baines, an exemplary employee, carried out her duties to the best of her abilities and with overall good judgment. We previously have affirmed a finding of unlawful motivation where the discharged employee had good evaluations. See N.L.R.B. v. S.E. Nichols-Dover, Inc., 414 F.2d 561, 564 (3d Cir.1969). The Center’s arguments do not undermine the Board’s conclusion that Baines’ termination was motivated by her union activity.
III. CONCLUSION
After consideration of the entire record, we conclude that substantial evidence supports the Board’s findings and conclusions. The issues were hotly contested and close. We cannot say that the Board erred. For the reasons set forth above, we deny the Center’s petition for review and we grant the Board’s application for enforcement of its order.3