diff --git a/version.cmake b/version.cmake
index 12e0d7c01..2c132db64 100644
--- a/version.cmake
+++ b/version.cmake
@@ -10,11 +10,11 @@ set(SUMMARY "${PROJECT_NAME} Game Boy Advance Emulator")
 
 find_program(GIT git)
 if(GIT AND NOT SKIP_GIT)
-	execute_process(COMMAND ${GIT} describe --always --abbrev=40 --dirty OUTPUT_VARIABLE GIT_COMMIT ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-	execute_process(COMMAND ${GIT} describe --always --dirty OUTPUT_VARIABLE GIT_COMMIT_SHORT ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-	execute_process(COMMAND ${GIT} symbolic-ref --short HEAD OUTPUT_VARIABLE GIT_BRANCH ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-	execute_process(COMMAND ${GIT} rev-list HEAD --count OUTPUT_VARIABLE GIT_REV ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
-	execute_process(COMMAND ${GIT} describe --tag --exact-match OUTPUT_VARIABLE GIT_TAG ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+	execute_process(COMMAND ${GIT} describe --always --abbrev=40 --dirty WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}" OUTPUT_VARIABLE GIT_COMMIT ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+	execute_process(COMMAND ${GIT} describe --always --dirty WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}" OUTPUT_VARIABLE GIT_COMMIT_SHORT ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+	execute_process(COMMAND ${GIT} symbolic-ref --short HEAD WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}" OUTPUT_VARIABLE GIT_BRANCH ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+	execute_process(COMMAND ${GIT} rev-list HEAD --count WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}" OUTPUT_VARIABLE GIT_REV ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
+	execute_process(COMMAND ${GIT} describe --tag --exact-match WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}" OUTPUT_VARIABLE GIT_TAG ERROR_QUIET OUTPUT_STRIP_TRAILING_WHITESPACE)
 endif()
 
 if(NOT GIT_REV)