diff --git a/Makefile.in b/Makefile.in
index 7bbc068d8..acc9af854 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -163,6 +163,9 @@ TRANSLATIONS := $(TRANSLATIONS_SRC:.po=.gmo)
 #Make everything needed for installing fish
 all: $(PROGRAMS) user_doc
 
+debug:
+	make fish CFLAGS="-O0 -Wno-unused -Werror -g @INCLUDEDIR@ -Wall -std=gnu99 -fno-strict-aliasing"
+
 # User documentation, describing the features of the fish shell.
 user_doc: doc.h Doxyfile.user user_doc.head.html
 	doxygen Doxyfile.user