diff --git a/src/cpuinfo/SDL_cpuinfo.c b/src/cpuinfo/SDL_cpuinfo.c
index 8a0e56e80..6be78765b 100644
--- a/src/cpuinfo/SDL_cpuinfo.c
+++ b/src/cpuinfo/SDL_cpuinfo.c
@@ -308,7 +308,7 @@ int
 SDL_GetCPUCount()
 {
     if (!SDL_CPUCount) {
-#ifdef HAVE_SYSCONF
+#if defined(HAVE_SYSCONF) && defined(_SC_NPROCESSORS_ONLN)
         if (SDL_CPUCount <= 0) {
             SDL_CPUCount = (int)sysconf(_SC_NPROCESSORS_ONLN);
         }