diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2fd5351..87f867d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -48,6 +48,7 @@ include (CTest)
 include (DetermineGflagsNamespace)
 include (GNUInstallDirs)
 
+set (CMAKE_DEBUG_POSTFIX d)
 set (CMAKE_THREAD_PREFER_PTHREAD 1)
 
 if (WITH_GFLAGS)