diff --git a/SWIG/Source/Swig/misc.c b/SWIG/Source/Swig/misc.c
index 8e0009cf1..4eb3225e9 100644
--- a/SWIG/Source/Swig/misc.c
+++ b/SWIG/Source/Swig/misc.c
@@ -733,6 +733,7 @@ int Swig_scopename_check(String *s) {
 #if defined(HAVE_POPEN)
 extern FILE *popen(const char *command, const char *type);
 extern int pclose(FILE *stream);
+#endif
 
 String *Swig_string_command(String *s) {
   String *res = NewStringEmpty();