diff --git a/tests/libtest/Makefile.am b/tests/libtest/Makefile.am
index 1ba02bf805..d06be22455 100644
--- a/tests/libtest/Makefile.am
+++ b/tests/libtest/Makefile.am
@@ -9,7 +9,7 @@ INCLUDES = -I$(top_srcdir)/include/curl
 LIBDIR = ../../lib
 
 # here are all tools used for running libcurl tests
-bin_PROGRAMS = lib500 lib501 lib502
+bin_PROGRAMS = lib500 lib501 lib502 lib503
 
 lib500_SOURCES = lib500.c first.c test.h
 lib500_LDADD = $(LIBDIR)/libcurl.la
@@ -22,3 +22,7 @@ lib501_DEPENDENCIES = $(LIBDIR)/libcurl.la
 lib502_SOURCES = lib502.c first.c test.h
 lib502_LDADD = $(LIBDIR)/libcurl.la
 lib502_DEPENDENCIES = $(LIBDIR)/libcurl.la
+
+lib503_SOURCES = lib503.c first.c test.h
+lib503_LDADD = $(LIBDIR)/libcurl.la
+lib503_DEPENDENCIES = $(LIBDIR)/libcurl.la