diff --git a/Makefile b/Makefile
index e15b27a375892bda2de8b828dacc81c79e75759e..5a2a346439b83a409f5da00519400b2e3aef9594 100644
--- a/Makefile
+++ b/Makefile
@@ -8,7 +8,7 @@ all: Makefile.coq
 
 clean: Makefile.coq
 	+@make -f Makefile.coq clean
-	find theories $$(test -d tests && echo tests) \( -name "*.v.d" -o -name "*.vo" -o -name "*.aux" -o -name "*.cache" -o -name "*.glob" -o -name "*.vio" \) -print -delete
+	find theories $$(test -d tests && echo tests) \( -name "*.d" -o -name "*.vo" -o -name "*.aux" -o -name "*.cache" -o -name "*.glob" -o -name "*.vio" \) -print -delete
 	rm -f Makefile.coq
 .PHONY: clean