diff --git a/libs/apr/include/fspr_general.h b/libs/apr/include/fspr_general.h
index 103f69f1df..e2261228c0 100644
--- a/libs/apr/include/fspr_general.h
+++ b/libs/apr/include/fspr_general.h
@@ -29,7 +29,7 @@
 #include "fspr_pools.h"
 #include "fspr_errno.h"
 
-#if !defined(_ANSI_SOURCE) && defined(_DARWIN_C_SOURCE)
+#if !defined(NSIG) && !defined(_ANSI_SOURCE) && defined(_DARWIN_C_SOURCE)
 #define NSIG __DARWIN_NSIG
 #endif