diff --git a/src/test_unit/Makefile.am b/src/test_unit/Makefile.am
index 23957a31..9f7c2e26 100644
--- a/src/test_unit/Makefile.am
+++ b/src/test_unit/Makefile.am
@@ -22,6 +22,7 @@ noinst_PROGRAMS = test_unit
 test_unit_LDADD = $(top_builddir)/src/libFLAC/libFLAC.la -lm
 test_unit_SOURCES = \
 	bitbuffer.c \
+	file_utils.c \
 	main.c \
 	metadata.c \
 	metadata_manip.c \
diff --git a/src/test_unit/Makefile.lite b/src/test_unit/Makefile.lite
index 7d7c4818..e69211ee 100644
--- a/src/test_unit/Makefile.lite
+++ b/src/test_unit/Makefile.lite
@@ -24,6 +24,7 @@ INCLUDES     = -I../libFLAC/include -I../../include
 LIBS         = -lFLAC -lm
 OBJS = \
 	bitbuffer.o \
+	file_utils.o \
 	main.o \
 	metadata.o \
 	metadata_manip.o \
diff --git a/src/test_unit/Makefile.vc b/src/test_unit/Makefile.vc
index f7890a86..62d4d353 100644
--- a/src/test_unit/Makefile.vc
+++ b/src/test_unit/Makefile.vc
@@ -27,6 +27,7 @@
 
 C_FILES= \
 	bitbuffer.c \
+	file_utils.c \
 	main.c \
 	metadata.c \
 	metadata_manip.c \