diff --git a/.travis.yml b/.travis.yml
index 6fef494..6cee8a3 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -7,7 +7,6 @@ php:
   - 7.1
   - 7.2
   - 7.3
-  - nightly
 
 script:
   - phpize
diff --git a/src/collections_methods.c b/src/collections_methods.c
index cc68d16..2bb61ef 100644
--- a/src/collections_methods.c
+++ b/src/collections_methods.c
@@ -26,9 +26,9 @@
 #define PAIR_SECOND(obj)         OBJ_PROP_NUM(obj, 1)
 
 #define IS_COLLECTION(val)                                                 \
-    Z_TYPE(val) == IS_OBJECT && Z_OBJCE(val) == collections_collection_ce
+    (Z_TYPE(val) == IS_OBJECT && Z_OBJCE(val) == collections_collection_ce)
 #define IS_PAIR(val)                                                       \
-    Z_TYPE(val) == IS_OBJECT && Z_OBJCE(val) == collections_pair_ce
+    (Z_TYPE(val) == IS_OBJECT && Z_OBJCE(val) == collections_pair_ce)
 
 #define SEPARATE_COLLECTION(ht, obj)                                       \
     if (GC_REFCOUNT(ht) > 1) {                                             \