diff --git a/ippl/src/CMakeLists.txt b/ippl/src/CMakeLists.txt
index 2c2f9abe4d2b5a94c7b0e2c30b954a001dcbe577..1df8073f702757eb1c5cc07e9c145d9fb1c667f9 100644
--- a/ippl/src/CMakeLists.txt
+++ b/ippl/src/CMakeLists.txt
@@ -145,7 +145,7 @@ SET (MAKE_DEF
 
 
 INCLUDE_DIRECTORIES (
-    ${CMAKE_CURRENT_SOURCE_DIR}
+    BEFORE ${CMAKE_CURRENT_SOURCE_DIR}
     )
 
 IF (ENABLE_DKS)
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 157ddb5aca128242d56ca28597d8c3e036755b6b..2e05334e1997b6bcb5b593591febb82e5b7266f1 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -73,7 +73,7 @@ add_subdirectory (ValueDefinitions)
 
 add_sources (opal.cpp)
 
-include_directories (
+include_directories ( BEFORE
     ${OPAL_SRC_DIR}
     ${CLASSIC_SRC_DIR}
     ${IPPL_INCLUDE_DIR}