diff --git a/ext/spl/spl_heap.c b/ext/spl/spl_heap.c
index b9f404ab113..b421c03757a 100644
--- a/ext/spl/spl_heap.c
+++ b/ext/spl/spl_heap.c
@@ -160,7 +160,7 @@ static int spl_ptr_heap_zval_max_cmp(zval *a, zval *b, zval *object TSRMLS_DC) {
 				/* exception or call failure */
 				return 0;
 			}
-			return lval > 0 ? 1 : -1;
+			return lval > 0 ? 1 : (lval < 0 ? -1 : 0);
 		}
 	}
 
@@ -184,7 +184,7 @@ static int spl_ptr_heap_zval_min_cmp(zval *a, zval *b, zval *object TSRMLS_DC) {
 				/* exception or call failure */
 				return 0;
 			}
-			return lval > 0 ? 1 : -1;
+			return lval > 0 ? 1 : (lval < 0 ? -1 : 0);
 		}
 	}
 
@@ -215,7 +215,7 @@ static int spl_ptr_pqueue_zval_cmp(zval *a, zval *b, zval *object TSRMLS_DC) { /
 				/* exception or call failure */
 				return 0;
 			}
-			return lval > 0 ? 1 : -1;
+			return lval > 0 ? 1 : (lval < 0 ? -1 : 0);
 		}
 	}