diff --git a/packages/PLStream/pl-incl.h b/packages/PLStream/pl-incl.h
index 9b36f78f8..c26d6865a 100644
--- a/packages/PLStream/pl-incl.h
+++ b/packages/PLStream/pl-incl.h
@@ -548,7 +548,7 @@ extern void  initCharTypes(void);
 
 /**** stuff from pl-os.c ****/
 extern void cleanupOs(void);
-extern void PL_clock_wait_ticks(intptr_t waited);
+extern void PL_clock_wait_ticks(long waited);
 extern void setOSFeatures(void);
 extern uintptr_t FreeMemory(void);
 extern uint64_t _PL_Random(void);