diff --git a/Modules/CheckForPthreads.c b/Modules/CheckForPthreads.c
index e70ceb1..ea1f7ac 100644
--- a/Modules/CheckForPthreads.c
+++ b/Modules/CheckForPthreads.c
@@ -1,6 +1,6 @@
 #include <pthread.h>
 
-void* start_routine(void* args)
+static void* start_routine(void* args)
 {
   return args;
 }