diff --git a/Makefile b/Makefile
index 494a7d8..90ace5f 100644
--- a/Makefile
+++ b/Makefile
@@ -7,9 +7,9 @@ INSTALL ?= install
 GZIP    ?= gzip
 TAR     ?= tar
 
-SRC = $(wildcard src/*.c)
-OBJ = $(addsuffix .o,$(SRC))
-DEP = $(addsuffix .d,$(SRC))
+SRC := $(wildcard src/*.c)
+OBJ := $(addsuffix .o,$(SRC))
+DEP := $(addsuffix .d,$(SRC))
 
 # Set Q to @ to silence commands being printed, unless --no-silent has been set
 ifeq (0, $(words $(findstring --no-silent,$(MAKEFLAGS))))