diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index efe3aed2f..0620f17bb 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -108,7 +108,6 @@ if(ENABLE_SWIFT)
                       -fmodule-map-file=${PROJECT_SOURCE_DIR}/dispatch/module.modulemap
                     SWIFT_FLAGS
                       -I ${PROJECT_SOURCE_DIR}
-                      -I/usr/include
                       ${swift_optimization_flags}
                     DEPENDS
                       ${PROJECT_SOURCE_DIR}/dispatch/module.modulemap)