diff --git a/test/test-process-title-threadsafe.c b/test/test-process-title-threadsafe.c
index d986576ed..cc3fd41a1 100644
--- a/test/test-process-title-threadsafe.c
+++ b/test/test-process-title-threadsafe.c
@@ -26,7 +26,7 @@
 #include <string.h>
 
 #ifdef __APPLE__
-# define NUM_ITERATIONS 20
+# define NUM_ITERATIONS 10
 #else
 # define NUM_ITERATIONS 50
 #endif