diff --git a/rtmp/rtmp.go b/rtmp/rtmp.go
index bea19140..728deaed 100644
--- a/rtmp/rtmp.go
+++ b/rtmp/rtmp.go
@@ -149,11 +149,6 @@ var (
 	}
 )
 
-// TODO: find location in c file
-func SET_RCVTIMEO(tv *int32, s int32) {
-	*tv = s * 1000
-}
-
 func startSession(rtmp *C_RTMP, u string, timeout uint32) (*C_RTMP, error) {
 	connect_timeout := int32(timeout)
 	rtmp = C_RTMP_Alloc()
diff --git a/rtmp/rtmp_sys.go b/rtmp/rtmp_sys.go
new file mode 100644
index 00000000..13fdc361
--- /dev/null
+++ b/rtmp/rtmp_sys.go
@@ -0,0 +1,7 @@
+package rtmp
+
+// #define SET_RCVTIMEO(tv,s)   int tv = s*1000
+// rtmp_sys.h +43
+func SET_RCVTIMEO(tv *int32, s int32) {
+	*tv = s * 1000
+}