diff --git a/CMakeLists.txt b/CMakeLists.txt
index 6db62d75..f7220c57 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -178,6 +178,7 @@ if(APPLE)
 # this should be handled by setting CMAKE_OSX_DEPLOYMENT_TARGET
 # but it's not working reliably, so forcing it for now
   SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mmacosx-version-min=10.7")
+  SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mmacosx-version-min=10.7")
 endif()
 
 if(${CMAKE_SYSTEM_NAME} MATCHES "Linux" OR