diff --git a/glm/CMakeLists.txt b/glm/CMakeLists.txt
index cee0d2e7..2d5cff2f 100644
--- a/glm/CMakeLists.txt
+++ b/glm/CMakeLists.txt
@@ -47,7 +47,7 @@ add_library(glm INTERFACE)
 include(GNUInstallDirs)
 
 target_include_directories(glm INTERFACE
-	$<BUILD_INTERFACE:${CMAKE_SOURCE_DIR}>
+	$<BUILD_INTERFACE:${PROJECT_SOURCE_DIR}>
 	$<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )