diff --git a/src/arch/x86/isa/microops/regop.isa b/src/arch/x86/isa/microops/regop.isa
index 570c0847f2..63a16831cf 100644
--- a/src/arch/x86/isa/microops/regop.isa
+++ b/src/arch/x86/isa/microops/regop.isa
@@ -1766,10 +1766,7 @@ let {{
         '''
 
     class Popcnt(RegOp):
-        code = '''
-            DestReg =
-                merge(DestReg, __builtin_popcountl(psrc1), dataSize);
-        '''
+        code = 'DestReg = merge(DestReg, popCount(psrc1), dataSize);'
         flag_code = '''
             ccFlagBits = ccFlagBits & ~(SFBit | AFBit | ZFBit | PFBit);
             if (findZero(dataSize * 8, SrcReg1)) {