diff --git a/scripts/cmake/version.cmake b/scripts/cmake/version.cmake
index 2f3cd63c9..9d234963f 100644
--- a/scripts/cmake/version.cmake
+++ b/scripts/cmake/version.cmake
@@ -84,7 +84,11 @@ if(EXISTS ${SOF_ROOT_SOURCE_DIRECTORY}/.git/)
 	string(SUBSTRING ${SOF_SRC_HASH_LONG} 0 8 SOF_SRC_HASH)
 	message(STATUS "Source content hash: ${SOF_SRC_HASH}")
 else()
-	string(SUBSTRING ${GIT_LOG_HASH} 0 8 SOF_SRC_HASH)
+	if("${GIT_LOG_HASH}")
+		string(SUBSTRING "${GIT_LOG_HASH}" 0 8 SOF_SRC_HASH)
+	else()
+		set(SOF_SRC_HASH "0")
+	endif()
 	message(WARNING "Source content hash not computed without git, using GIT_LOG_HASH instead")
 endif()