diff --git a/Makefile b/Makefile
index 0b6f074..b796c98 100644
--- a/Makefile
+++ b/Makefile
@@ -6,7 +6,9 @@ SRC_DIR := src
 
 RES_DIR := res
 
-SRCS := $(wildcard $(SRC_DIR)/*/*.kt)
+rwildcard=$(wildcard $1$2) $(foreach d,$(wildcard $1*),$(call rwildcard,$d/,$2))
+
+SRCS := $(call rwildcard,$(SRC_DIR),*.kt)
 
 CLASSNAME := com.Hello