diff --git a/CMakeLists.txt b/CMakeLists.txt
index 648a5f20b7..a3b1fe097d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -47,9 +47,9 @@ if (WIN32)
   # TODO: Remove when building 64-bit.
   set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} /LARGEADDRESSAWARE")
 else ()
-  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Wdouble-promotion -fno-strict-aliasing -Wno-unused-parameter")
+  set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -fno-strict-aliasing -Wno-unused-parameter")
   if (CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX)
-      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ggdb")
+      set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -ggdb -Wdouble-promotion")
   endif ()
 endif(WIN32)