diff --git a/src/vm/wren_primitive.h b/src/vm/wren_primitive.h
index a6421c1d..eb55fe84 100644
--- a/src/vm/wren_primitive.h
+++ b/src/vm/wren_primitive.h
@@ -81,7 +81,7 @@ bool validateInt(WrenVM* vm, Value arg, const char* argName);
 
 // Validates that [arg] is a valid object for use as a map key. Returns true if
 // it is. If not, reports an error and returns false.
-bool validateKey(WrenVM * vm, Value arg);
+bool validateKey(WrenVM* vm, Value arg);
 
 // Validates that the argument at [argIndex] is an integer within `[0, count)`.
 // Also allows negative indices which map backwards from the end. Returns the