diff --git a/Makefile.psp1 b/Makefile.psp1
index df1d86e3f3..9ad47cc20c 100644
--- a/Makefile.psp1
+++ b/Makefile.psp1
@@ -19,7 +19,7 @@ ifeq ($(WHOLE_ARCHIVE_LINK), 1)
    WHOLE_END := -Wl,--no-whole-archive
 endif
 
-INCDIR = deps/rzlib deps/7zip libretro-common/include
+INCDIRS = -Ideps/rzlib deps/7zip -Ilibretro-common/include
 CFLAGS = $(OPTIMIZE_LV) -G0 -std=gnu99 -ffast-math
 ASFLAGS = $(CFLAGS)
 
@@ -45,7 +45,7 @@ ifeq ($(BIG_STACK), 1)
 CFLAGS += -DBIG_STACK
 endif
 
-CFLAGS += $(RARCH_DEFINES)
+CFLAGS += $(RARCH_DEFINES) $(INCDIRS)
 
 
 EXTRA_TARGETS = EBOOT.PBP