--- a/CMakeLists.txt	2020-05-09 16:43:10.000000000 +0200
+++ b/CMakeLists.txt	2020-06-03 20:50:46.532419900 +0200
@@ -108,7 +108,7 @@
 
 LIST(APPEND CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
 
-SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -I${PROJECT_SOURCE_DIR}/src")
+SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -I\"${PROJECT_SOURCE_DIR}/src\"")
 
 # external packages
 FIND_PACKAGE( BZip2 )