diff --git a/CMakeLists.txt b/CMakeLists.txt
index c9f73ce96..d14ffeed9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -339,13 +339,13 @@ macro(run_vk_xml_generate dependency output)
 endmacro()
 
 # Define macro used for generating header files containing commit IDs for external dependencies
-macro(run_external_revision_generate source_dir symbol_name output)
+macro(run_external_revision_generate rev_file symbol_name output)
     add_custom_command(OUTPUT ${output}
     # NOTE: If you modify this call to use --rev_file instead of --git_dir (to read the commit ID from a file instead of
     # parsing from a Git repository), you probably also want to add the revision file to the list of DEPENDS on the
     # subsequent line (to ensure that the script is re-run when the revision file is modified).
-    COMMAND ${PYTHON_CMD} ${SCRIPTS_DIR}/external_revision_generator.py --git_dir ${source_dir} -s ${symbol_name} -o ${output}
-    DEPENDS ${SCRIPTS_DIR}/external_revision_generator.py ${source_dir}/.git/HEAD ${source_dir}/.git/index
+    COMMAND ${PYTHON_CMD} ${SCRIPTS_DIR}/external_revision_generator.py --rev_file ${rev_file} -s ${symbol_name} -o ${output}
+    DEPENDS ${SCRIPTS_DIR}/external_revision_generator.py ${rev_file}
     )
 endmacro()