diff --git a/common/CMakeLists.txt b/common/CMakeLists.txt
index f79acfef1..5148c77d1 100644
--- a/common/CMakeLists.txt
+++ b/common/CMakeLists.txt
@@ -4,7 +4,7 @@
 # Build info header
 #
 
-if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../.git")
+if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../.git/index")
     set(GIT_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../.git")
 
     # Is git submodule