diff --git a/projects/unix/Makefile b/projects/unix/Makefile
index 9ee7226..a257137 100644
--- a/projects/unix/Makefile
+++ b/projects/unix/Makefile
@@ -91,10 +91,14 @@ ifeq ("$(CPU)","OTHER")
   PIC ?= 1
 endif
 
+# directory paths
+SRCDIR = ../../src
+OBJDIR = _obj$(POSTFIX)
+
 # base CFLAGS, LDLIBS, and LDFLAGS
 OPTFLAGS ?= -O3 -flto
 WARNFLAGS ?= -Wall
-CFLAGS += $(OPTFLAGS) $(WARNFLAGS) -ffast-math -fno-strict-aliasing -fvisibility=hidden -I../../src -D_GNU_SOURCE=1
+CFLAGS += $(OPTFLAGS) $(WARNFLAGS) -ffast-math -fno-strict-aliasing -fvisibility=hidden -I$(SRCDIR) -D_GNU_SOURCE=1
 LDFLAGS += $(SHARED)
 LDLIBS += -lm
 
@@ -229,9 +233,6 @@ ifeq ($(PLUGINDIR),)
   PLUGINDIR := $(LIBDIR)/mupen64plus
 endif
 
-SRCDIR = ../../src
-OBJDIR = _obj$(POSTFIX)
-
 # list of source files to compile
 SOURCE = \
 	$(SRCDIR)/plugin_front.c \