diff --git a/sc2/src/port.h b/sc2/src/port.h
index 8a83e6882..5f84301d6 100644
--- a/sc2/src/port.h
+++ b/sc2/src/port.h
@@ -102,7 +102,7 @@ typedef unsigned short mode_t;
 #	elif defined (_MSC_VER)
 #		define alloca _alloca
 #	endif
-#else
+#elif defined(__linux__) || defined(__svr4__)
 #	include <alloca.h>
 #endif
 
diff --git a/sc2/src/sc2code/libs/uio/uioport.h b/sc2/src/sc2code/libs/uio/uioport.h
index 31b95937d..ac626f967 100644
--- a/sc2/src/sc2code/libs/uio/uioport.h
+++ b/sc2/src/sc2code/libs/uio/uioport.h
@@ -152,7 +152,7 @@ typedef unsigned short mode_t;
 #	elif defined (_MSC_VER)
 #		define alloca _alloca
 #	endif
-#else
+#elif defined(__linux__) || defined(__svr4__)
 #	include <alloca.h>
 #endif