diff --git a/Makefile b/Makefile
index 0d03262312..bc71a02e16 100644
--- a/Makefile
+++ b/Makefile
@@ -70,6 +70,7 @@ LD         := $(MIPS_BINUTILS_PREFIX)ld
 OBJCOPY    := $(MIPS_BINUTILS_PREFIX)objcopy
 OBJDUMP    := $(MIPS_BINUTILS_PREFIX)objdump
 
+IINC       := -Iinclude -Isrc -Iassets -Ibuild -I.
 ifeq ($(KEEP_MDEBUG),0)
   RM_MDEBUG = $(OBJCOPY) --remove-section .mdebug $@
 else
@@ -78,7 +79,7 @@ endif
 
 # Check code syntax with host compiler
 CHECK_WARNINGS := -Wall -Wextra -Wno-format-security -Wno-unknown-pragmas -Wno-unused-parameter -Wno-unused-variable -Wno-missing-braces -Wno-int-conversion -Wno-unused-but-set-variable -Wno-unused-label
-CC_CHECK   := gcc -fno-builtin -fsyntax-only -funsigned-char -std=gnu90 -D _LANGUAGE_C -D NON_MATCHING -Iinclude -Isrc -Iassets -Ibuild -include stdarg.h $(CHECK_WARNINGS)
+CC_CHECK   := gcc -fno-builtin -fsyntax-only -funsigned-char -std=gnu90 -D _LANGUAGE_C -D NON_MATCHING $(IINC) -include stdarg.h $(CHECK_WARNINGS)
 
 CPP        := cpp
 ELF2ROM    := tools/buildtools/elf2rom
@@ -91,7 +92,7 @@ ASFLAGS := -march=vr4300 -32 -Iinclude
 MIPS_VERSION := -mips2
 
 # we support Microsoft extensions such as anonymous structs, which the compiler does support but warns for their usage. Surpress the warnings with -woff.
-CFLAGS += -G 0 -non_shared -Xfullwarn -Xcpluscomm -Iinclude -Isrc -Iassets -Ibuild -I. -Wab,-r4300_mul -woff 624,649,838,712
+CFLAGS += -G 0 -non_shared -Xfullwarn -Xcpluscomm $(IINC) -Wab,-r4300_mul -woff 624,649,838,712
 
 ifeq ($(shell getconf LONG_BIT), 32)
   # Work around memory allocation bug in QEMU