diff --git a/CMakeLists.txt b/CMakeLists.txt
index 54c5196..0960bd8 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -87,7 +87,7 @@ else()
             message(FATAL_ERROR "Fetching and compiling live555 failed!")
         endif()
         message(STATUS "patch live555")
-        EXECUTE_PROCESS(COMMAND patch -d ${CMAKE_BINARY_DIR} -f -p 1 -i ${CMAKE_SOURCE_DIR}/patches/001_live555_sprintf_format RESULT_VARIABLE patch_result)
+        EXECUTE_PROCESS(COMMAND patch -d ${CMAKE_BINARY_DIR} -f -p 1 -i ${PROJECT_SOURCE_DIR}/patches/001_live555_sprintf_format RESULT_VARIABLE patch_result)
         if(NOT patch_result STREQUAL "0")
             message(FATAL_ERROR "Patching live555 failed! error:${patch_result}")
         endif()