diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9fd1f7ae1..5df984ab8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -60,7 +60,7 @@ set(ICINGA2_BUILD_COMPILER_NAME "${CMAKE_CXX_COMPILER_ID}")
 
 if(NOT CMAKE_CXX_COMPILER_VERSION)
   execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion
-    OUTPUT_VARIABLE CMAKE_CXX_COMPILER_VERSION)
+    OUTPUT_VARIABLE CMAKE_CXX_COMPILER_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
 endif()
 
 set(ICINGA2_BUILD_COMPILER_VERSION "${CMAKE_CXX_COMPILER_VERSION}")