diff --git a/Makefile.am b/Makefile.am
index 9e4c7bd..371c649 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -46,4 +46,5 @@ libcriterion_la_SOURCES = \
 	src/logging.c \
 	src/options.c \
 	src/timer.c \
+	src/timer.h \
 	src/main.c