diff --git a/libguile/Makefile.am b/libguile/Makefile.am
index 7f8b2f3de..9051d46c9 100644
--- a/libguile/Makefile.am
+++ b/libguile/Makefile.am
@@ -180,7 +180,7 @@ SUFFIXES = .x .doc
 	PATH=.:${PATH} ./guile-doc-snarf $< $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) $< > $@ \
 	|| { rm $@; false; }
 .c.doc:
-	PATH=.:${PATH} ./guile-doc-snarf $< $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) $< \
+	PATH=.:${PATH} ./guile-doc-snarf $< $(DEFS) $(INCLUDES) $(CPPFLAGS) $(CFLAGS) $< > /dev/null \
         || { rm $@; false; }
 
 guile-procedures.txt: $(DOT_DOC_FILES) $(EXTRA_DOT_DOC_FILES)