diff --git a/src/m_pd.h b/src/m_pd.h
index 1be6479dcb..86a1644c50 100644
--- a/src/m_pd.h
+++ b/src/m_pd.h
@@ -11,7 +11,7 @@ extern "C" {
 #define PD_MAJOR_VERSION 0
 #define PD_MINOR_VERSION 51
 #define PD_BUGFIX_VERSION 3
-#define PD_TEST_VERSION "test4"
+#define PD_TEST_VERSION "test5"
 extern int pd_compatibilitylevel;   /* e.g., 43 for pd 0.43 compatibility */
 
 /* old name for "MSW" flag -- we have to take it for the sake of many old