diff --git a/bare-arm/Makefile b/bare-arm/Makefile
index eeaaf423d0..2809b18932 100644
--- a/bare-arm/Makefile
+++ b/bare-arm/Makefile
@@ -9,6 +9,7 @@ include ../py/py.mk
 CROSS_COMPILE = arm-none-eabi-
 
 INC =  -I.
+INC += -I..
 INC += -I$(PY_SRC)
 INC += -I$(BUILD)
 
diff --git a/qemu-arm/Makefile b/qemu-arm/Makefile
index 9005380809..bb0880c864 100644
--- a/qemu-arm/Makefile
+++ b/qemu-arm/Makefile
@@ -10,6 +10,7 @@ include ../py/py.mk
 CROSS_COMPILE = arm-none-eabi-
 
 INC =  -I.
+INC += -I..
 INC += -I$(PY_SRC)
 INC += -I$(BUILD)
 
diff --git a/stmhal/Makefile b/stmhal/Makefile
index 9c2c23c0c4..98f31ebadd 100644
--- a/stmhal/Makefile
+++ b/stmhal/Makefile
@@ -32,6 +32,7 @@ DEVICE=0483:df11
 CROSS_COMPILE = arm-none-eabi-
 
 INC =  -I.
+INC += -I..
 INC += -I$(PY_SRC)
 INC += -I$(BUILD)
 INC += -I$(CMSIS_DIR)/inc
diff --git a/teensy/Makefile b/teensy/Makefile
index 5ea4c9dad2..20ba41901d 100644
--- a/teensy/Makefile
+++ b/teensy/Makefile
@@ -30,6 +30,7 @@ CFLAGS_TEENSY = -DF_CPU=96000000 -DUSB_SERIAL -D__MK20DX256__
 CFLAGS_CORTEX_M4 = -mthumb -mtune=cortex-m4 -mcpu=cortex-m4 -msoft-float -mfloat-abi=soft -fsingle-precision-constant -Wdouble-promotion $(CFLAGS_TEENSY)
 
 INC =  -I.
+INC += -I..
 INC += -I$(PY_SRC)
 INC += -I../stmhal
 INC += -I$(BUILD)
diff --git a/unix-cpy/Makefile b/unix-cpy/Makefile
index eb4088861c..6a60c35330 100644
--- a/unix-cpy/Makefile
+++ b/unix-cpy/Makefile
@@ -7,6 +7,7 @@ PROG = cpy
 include ../py/py.mk
 
 INC =  -I.
+INC += -I..
 INC += -I$(PY_SRC)
 INC += -I$(BUILD)
 
diff --git a/unix/Makefile b/unix/Makefile
index de3aef398f..bfd9497542 100644
--- a/unix/Makefile
+++ b/unix/Makefile
@@ -14,6 +14,7 @@ UNAME_S := $(shell uname -s)
 include ../py/py.mk
 
 INC =  -I.
+INC +=  -I..
 INC += -I$(PY_SRC)
 INC += -I$(BUILD)
 
diff --git a/windows/Makefile b/windows/Makefile
index 28b73d614c..f73e166909 100644
--- a/windows/Makefile
+++ b/windows/Makefile
@@ -11,6 +11,7 @@ QSTR_DEFS = ../unix/qstrdefsport.h
 include ../py/py.mk
 
 INC =  -I.
+INC += -I..
 INC += -I$(PY_SRC)
 INC += -I$(BUILD)