diff --git a/Tests/BuildDepends/Project/CMakeLists.txt b/Tests/BuildDepends/Project/CMakeLists.txt
index 25460388e..f9cbc5661 100644
--- a/Tests/BuildDepends/Project/CMakeLists.txt
+++ b/Tests/BuildDepends/Project/CMakeLists.txt
@@ -1,4 +1,4 @@
 project(testRebuild)
-add_library(foo STATIC ${testRebuild_BINARY_DIR}/foo.c)
-add_executable(bar bar.c)
+add_library(foo STATIC ${testRebuild_BINARY_DIR}/foo.cxx)
+add_executable(bar bar.cxx)
 target_link_libraries(bar foo)