diff --git a/cmake/cflags-generic.cmake b/cmake/cflags-generic.cmake
index 35bbe9f4..6bc60502 100644
--- a/cmake/cflags-generic.cmake
+++ b/cmake/cflags-generic.cmake
@@ -32,7 +32,7 @@ if(FREEBSD OR NETBSD)
 endif()
 
 if(NETBSD)
-    set(EXTRA_C_FLAGS "${EXTRA_CXX_FLAGS} -DHAVE_BUILTIN_POPCOUNT")
+    set(EXTRA_C_FLAGS "${EXTRA_C_FLAGS} -DHAVE_BUILTIN_POPCOUNT")
     set(EXTRA_CXX_FLAGS "${EXTRA_CXX_FLAGS} -DHAVE_BUILTIN_POPCOUNT")
 endif()