diff --git a/sources.mk b/sources.mk
index 7271428..49e35cb 100644
--- a/sources.mk
+++ b/sources.mk
@@ -1,5 +1,27 @@
 SRC_DIR = src
-SRCS =
+SRCS += $(SRC_DIR)/utils/checksum.c
+SRCS += $(SRC_DIR)/utils/time.c
+SRCS += $(SRC_DIR)/error/set_error.c
+SRCS += $(SRC_DIR)/error/strerror.c
+SRCS += $(SRC_DIR)/error/should_retry.c
+SRCS += $(SRC_DIR)/socket/create.c
+SRCS += $(SRC_DIR)/socket/configure.c
+SRCS += $(SRC_DIR)/socket/utils.c
+SRCS += $(SRC_DIR)/handle/create.c
+SRCS += $(SRC_DIR)/handle/destroy.c
+SRCS += $(SRC_DIR)/handle/get_fd.c
+SRCS += $(SRC_DIR)/packet/build.c
+SRCS += $(SRC_DIR)/packet/parse_ip.c
+SRCS += $(SRC_DIR)/packet/parse_icmp.c
 
 TESTS_DIR = tests
-TESTS =
+TESTS += $(TESTS_DIR)/utils/test_checksum.c
+TESTS += $(TESTS_DIR)/utils/test_time.c
+TESTS += $(TESTS_DIR)/error/test_error.c
+TESTS += $(TESTS_DIR)/socket/test_socket.c
+TESTS += $(TESTS_DIR)/handle/test_create.c
+TESTS += $(TESTS_DIR)/handle/test_destroy.c
+TESTS += $(TESTS_DIR)/handle/test_get_fd.c
+TESTS += $(TESTS_DIR)/packet/test_build.c
+TESTS += $(TESTS_DIR)/packet/test_parse_ip.c
+TESTS += $(TESTS_DIR)/packet/test_parse_icmp.c