diff --git a/src_main/containers/pideque.h b/src_main/containers/pideque.h
index 3a4d7c21..4a53aa53 100755
--- a/src_main/containers/pideque.h
+++ b/src_main/containers/pideque.h
@@ -188,13 +188,13 @@ public:
 		return ec;
 	}
 	inline ssize_t indexOf(const T & v) const {
-		for (ssize_t i = pid_start; i < pid_start + pid_size; ++i)
+		for (ssize_t i = pid_start; i < pid_start + (ssize_t)pid_size; ++i)
 			if (v == pid_data[i])
 				return i - pid_start;
 		return -1;
 	}
 	inline ssize_t lastIndexOf(const T & v) const {
-		for (ssize_t i = pid_start + pid_size - 1; i >= pid_start; --i)
+		for (ssize_t i = pid_start + (ssize_t)pid_size - 1; i >= pid_start; --i)
 			if (v == pid_data[i])
 				return i - pid_start;
 		return -1;