diff --git a/src/tests/Makefile.am b/src/tests/Makefile.am
index cd0118d..907708d 100644
--- a/src/tests/Makefile.am
+++ b/src/tests/Makefile.am
@@ -5,10 +5,10 @@ if BUILD_TESTS
   noinst_PROGRAMS = ocb-aes encrypt-decrypt
 endif
 
-ocb_aes_SOURCES = ocb-aes.cc test_utils.cc
+ocb_aes_SOURCES = ocb-aes.cc test_utils.cc test_utils.h
 ocb_aes_CPPFLAGS = -I$(srcdir)/../crypto -I$(srcdir)/../util
 ocb_aes_LDADD = ../crypto/libmoshcrypto.a ../util/libmoshutil.a
 
-encrypt_decrypt_SOURCES = encrypt-decrypt.cc test_utils.cc
+encrypt_decrypt_SOURCES = encrypt-decrypt.cc test_utils.cc test_utils.h
 encrypt_decrypt_CPPFLAGS = -I$(srcdir)/../crypto -I$(srcdir)/../util
 encrypt_decrypt_LDADD = ../crypto/libmoshcrypto.a ../util/libmoshutil.a