diff --git a/src/Makefile.am b/src/Makefile.am
index 3f1094f..af01dc1 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -6,7 +6,7 @@ libr3_la_LIBADD=$(DEPS_LIBS)
 AM_CFLAGS=$(DEPS_CFLAGS) -I$(top_builddir) -I$(top_builddir)/include -Wall
 
 if ENABLE_DEBUG
-AM_CFLAGS += -g
+AM_CFLAGS += -g -fprofile-arcs -ftest-coverage
 endif
 
 if ENABLE_GRAPHVIZ