diff --git a/CMakeLists.txt b/CMakeLists.txt
index e678576..390a694 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -9,10 +9,9 @@ INCLUDE(CheckIncludeFile)
 INCLUDE(CheckLibraryExists)
 INCLUDE(CheckFunctionExists)
 
-IF    (NOT CMAKE_BUILD_TYPE)
-  SET (CMAKE_BUILD_TYPE Debug)
+IF    (CMAKE_BUILD_TYPE EQUAL "Debug")
   SET (CMAKE_C_FLAGS "-ggdb -O0 -Wall -pedantic -DDEBUG -std=c99")
-ENDIF (NOT CMAKE_BUILD_TYPE)
+ENDIF (CMAKE_BUILD_TYPE EQUAL "Debug")
 
 # set paths
 SET(CMAKE_INSTALL_PREFIX "/usr")