diff --git a/Makefile.in b/Makefile.in
index aaf7b3b..76379d2 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -236,7 +236,7 @@ $(STATIC_LTC): $(OPTION_HEADERS)
 $(STATIC_LTM): $(OPTION_HEADERS)
 	$(MAKE) -C libtommath
 
-.PHONY : clean sizes thisclean distclean tidy ltc-clean ltm-clean
+.PHONY : clean sizes thisclean distclean tidy ltc-clean ltm-clean lint
 
 ltc-clean:
 	$(MAKE) -C libtomcrypt clean
@@ -262,6 +262,9 @@ distclean: clean tidy
 tidy:
 	-rm -f *~ *.gcov */*~
 
+lint:
+	cd $(srcdir); ./dropbear_lint.sh
+
 ## Fuzzing targets
 
 # list of fuzz targets
diff --git a/dropbear_lint.sh b/dropbear_lint.sh
new file mode 100755
index 0000000..25a4b7d
--- /dev/null
+++ b/dropbear_lint.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+
+EXITCODE=0
+
+# #ifdef instead of #if
+grep '#ifdef DROPBEAR' -I *.c *.h && EXITCODE=1
+
+exit $EXITCODE
diff --git a/release.sh b/release.sh
index 525cef3..ea3aa1d 100755
--- a/release.sh
+++ b/release.sh
@@ -30,6 +30,7 @@ fi
 hg archive "$RELDIR"  || exit 2
 
 (cd "$RELDIR" && autoconf && autoheader) || exit 2
+(cd "$RELDIR" && make lint) || exit 2
 
 rm -r "$RELDIR/autom4te.cache" || exit 2