diff --git a/src/emu/emucore.h b/src/emu/emucore.h
index 02a43eb181f..1e5e87be8d1 100644
--- a/src/emu/emucore.h
+++ b/src/emu/emucore.h
@@ -373,7 +373,7 @@ ATTR_NORETURN void fatalerror_exitcode(running_machine &machine, int exitcode, c
 //**************************************************************************
 
 // population count
-#if defined(__NetBSD__)
+#if !defined(__NetBSD__)
 inline int popcount(UINT32 val)
 {
 	int count;