diff --git a/Makefile b/Makefile
index 8112c03c10..3dc7c960ed 100644
--- a/Makefile
+++ b/Makefile
@@ -9,7 +9,7 @@ BUILD_DIR = build
 
 SRC_DIRS := src src/os src/os/nusys
 ASM_DIRS := asm asm/os
-INCLUDE_DIRS := include include/PR
+INCLUDE_DIRS := include include/PR src
 DATA_DIRS := bin
 
 # Source code files
@@ -86,7 +86,7 @@ $(BUILD_DIR)/$(TARGET).elf: $(O_FILES) $(LD_SCRIPT)
 $(BUILD_DIR)/%.o: %.s
 	$(AS) $(ASFLAGS) -o $@ $<
 
-$(BUILD_DIR)/%.o: %.c %.h $(H_FILES)
+$(BUILD_DIR)/%.o: %.c $(H_FILES)
 	cpp $(CPPFLAGS) $< | $(CC) $(CFLAGS) -o - | $(OLD_AS) $(OLDASFLAGS) - -o $@
 
 $(BUILD_DIR)/%.o: %.bin