diff --git a/Makefile b/Makefile
index b523ef3205..002eb790d1 100644
--- a/Makefile
+++ b/Makefile
@@ -65,9 +65,7 @@ FIX := tools/gbafix/gbafix$(EXE)
 
 .PHONY: rom clean compare tidy
 
-$(shell mkdir -p $(C_BUILDDIR) $(ASM_BUILDDIR) $(DATA_ASM_BUILDDIR) $(SONG_BUILDDIR) $(MID_BUILDDIR))
-
-C_SRCS := $(wildcard $(C_SUBDIR)/*.c)
+C_SRCS := $(wildcard $(C_SUBDIR)/*.c $(C_SUBDIR)/*/*.c $(C_SUBDIR)/*/*/*.c)
 C_OBJS := $(patsubst $(C_SUBDIR)/%.c,$(C_BUILDDIR)/%.o,$(C_SRCS))
 
 ASM_SRCS := $(wildcard $(ASM_SUBDIR)/*.s)
@@ -82,9 +80,13 @@ SONG_OBJS := $(patsubst $(SONG_SUBDIR)/%.s,$(SONG_BUILDDIR)/%.o,$(SONG_SRCS))
 MID_SRCS := $(wildcard $(MID_SUBDIR)/*.mid)
 MID_OBJS := $(patsubst $(MID_SUBDIR)/%.mid,$(MID_BUILDDIR)/%.o,$(MID_SRCS))
 
-OBJS := $(C_OBJS) $(ASM_OBJS) $(DATA_ASM_OBJS) $(SONG_OBJS) $(MID_OBJS)
+OBJS     := $(C_OBJS) $(ASM_OBJS) $(DATA_ASM_OBJS) $(SONG_OBJS) $(MID_OBJS)
 OBJS_REL := $(patsubst $(OBJ_DIR)/%,%,$(OBJS))
 
+SUBDIRS  := $(sort $(dir $(OBJS)))
+
+$(shell mkdir -p $(SUBDIRS))
+
 rom: $(ROM)
 
 # For contributors to make sure a change didn't affect the contents of the ROM.