diff --git a/GNUmakefile b/GNUmakefile
index 550bda398..a21342d6a 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -1,13 +1,18 @@
 NPX?=	npx
 PRETTIER?=	$(NPX) prettier
 
+
+CONTROL_SRC:=	$(shell find ./controls -type f -name "*.md")
+
+
+
 .PHONY: all
 all: fmt
 
 .PHONY: fmt
 fmt:
-	$(PRETTIER) --write --prose-wrap always controls/**/*.md
+	$(PRETTIER) --write --prose-wrap always $(CONTROL_SRC)
 
 .PHONY: fmt-check
 fmt-check:
-	$(PRETTIER) --check --prose-wrap always controls/**/*.md
+	$(PRETTIER) --check --prose-wrap always $(CONTROL_SRC)