diff --git a/testing/ostest/Makefile b/testing/ostest/Makefile
index 128a31798..1fedfcf54 100644
--- a/testing/ostest/Makefile
+++ b/testing/ostest/Makefile
@@ -31,8 +31,7 @@ MODULE = $(CONFIG_TESTING_OSTEST)
 
 # NuttX OS Test
 
-CSRCS   = getopt.c libc_memmem.c restart.c \
-          signest.c sighelper.c
+CSRCS   = getopt.c libc_memmem.c restart.c sighelper.c
 
 ifeq ($(CONFIG_ENABLE_ALL_SIGNALS),y)
 CSRCS += sighand.c signest.c