diff --git a/Realm/RLMProperty.mm b/Realm/RLMProperty.mm
index 540d0ee72d..8be7054614 100644
--- a/Realm/RLMProperty.mm
+++ b/Realm/RLMProperty.mm
@@ -140,10 +140,12 @@ - (void)updateAccessors {
 }
 
 static realm::util::Optional<RLMPropertyType> typeFromProtocolString(const char *type) {
-    if (strncmp(type, "RLM", 3)) {
+    static const char *ClassPrefix = "RLM";
+
+    if (strncmp(type, ClassPrefix, strlen(ClassPrefix))) {
         return realm::none;
     }
-    type += 3;
+    type += strlen(ClassPrefix);
     if (strcmp(type, "Int>\"") == 0) {
         return RLMPropertyTypeInt;
     }