diff --git a/src/pkg/runtime/alg.c b/src/pkg/runtime/alg.c
index eec523aad4..e3c42916e9 100644
--- a/src/pkg/runtime/alg.c
+++ b/src/pkg/runtime/alg.c
@@ -271,7 +271,7 @@ runtime·f64hash(uintptr *h, uintptr s, void *a)
 	else {
 		u = *(uint64*)a;
 		if(sizeof(uintptr) == 4)
-			hash = ((uint32)(u>>32) ^ 2860486313) * (uint32)u;
+			hash = ((uint32)(u>>32) * 3267000013UL) ^ (uint32)u;
 		else
 			hash = u;
 	}