diff --git a/src/pulse/timeval.h b/src/pulse/timeval.h
index 60b9d0857..a7d3ba335 100644
--- a/src/pulse/timeval.h
+++ b/src/pulse/timeval.h
@@ -36,6 +36,7 @@ PA_C_DECL_BEGIN
 #define PA_MSEC_PER_SEC 1000
 #define PA_USEC_PER_SEC 1000000
 #define PA_NSEC_PER_SEC 1000000000
+#define PA_USEC_PER_MSEC 1000
 
 struct timeval;