diff --git a/dlls/kernel32/heap.c b/dlls/kernel32/heap.c
index 3120058..41987a5 100644
--- a/dlls/kernel32/heap.c
+++ b/dlls/kernel32/heap.c
@@ -1133,7 +1133,7 @@ BOOL WINAPI GlobalMemoryStatusEx( LPMEMORYSTATUSEX lpmemex )
     SYSTEM_INFO si;
 #ifdef linux
     FILE *f;
-#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__)
+#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__)
     unsigned long val;
     int mib[2];
     size_t size_sys;
@@ -1205,7 +1205,7 @@ BOOL WINAPI GlobalMemoryStatusEx( LPMEMORYSTATUSEX lpmemex )
         }
         fclose( f );
     }
-#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__APPLE__)
+#elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__APPLE__)
     mib[0] = CTL_HW;
     mib[1] = HW_PHYSMEM;
     size_sys = sizeof(val);