diff --git a/eclair/external_sources.ecl b/eclair/external_sources.ecl
index 9d9087a..5410c1a 100644
--- a/eclair/external_sources.ecl
+++ b/eclair/external_sources.ecl
@@ -17,3 +17,5 @@
 # Ignore any auto-generated source files in build dir.
 -file_tag+={external, "^trusted-firmware-m/build/.*$"}
 
+# Ignore compiler internal headers.
+-file_tag+={external, "^/.+/compiler/gcc-.*$"}