diff --git a/unix/Makefile b/unix/Makefile
index b0899ecac5..ac1baf3d00 100644
--- a/unix/Makefile
+++ b/unix/Makefile
@@ -28,12 +28,12 @@ LDFLAGS_MOD += -lreadline
 endif
 ifeq ($(MICROPY_MOD_TIME),1)
 CFLAGS_MOD += -DMICROPY_MOD_TIME=1
-SRC_MOD += time.c
+SRC_MOD += modtime.c
 endif
 ifeq ($(MICROPY_MOD_FFI),1)
 CFLAGS_MOD += `pkg-config --cflags libffi` -DMICROPY_MOD_FFI=1
 LDFLAGS_MOD += -ldl -lffi
-SRC_MOD += ffi.c
+SRC_MOD += modffi.c
 endif
 
 
@@ -50,7 +50,7 @@ SRC_C = \
 	main.c \
 	gccollect.c \
 	file.c \
-	socket.c \
+	modsocket.c \
 	$(SRC_MOD)
 
 OBJ = $(PY_O) $(addprefix $(BUILD)/, $(SRC_C:.c=.o))
diff --git a/unix/ffi.c b/unix/modffi.c
similarity index 100%
rename from unix/ffi.c
rename to unix/modffi.c
diff --git a/unix/socket.c b/unix/modsocket.c
similarity index 100%
rename from unix/socket.c
rename to unix/modsocket.c
diff --git a/unix/time.c b/unix/modtime.c
similarity index 100%
rename from unix/time.c
rename to unix/modtime.c