tests: enable sign compare

Change-Id: Ib316109ef38617df9ce7bcc2851354cdf14e192a
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index b10fa35..b85c52f 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -26,7 +26,7 @@
     endif()
 
 else()
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-sign-compare -std=c++11")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++11")
 endif()
 
 set (LIBGLM_INCLUDE_DIR ${PROJECT_SOURCE_DIR}/libs)