diff --git a/tests/src/random.c b/tests/src/random.c
index a09ea4a..340b935 100644
--- a/tests/src/random.c
+++ b/tests/src/random.c
@@ -68,7 +68,7 @@ vtype_uint16 random_uint16() {
 }
 
 vtype_uint32 random_uint32() {
-    return rand() << 1 | rand()&1;
+    return (rand()<<1) | (rand()&1);
 }
 
 vtype_uint64 random_uint64() {