diff --git a/src/Makefile b/src/Makefile
index 8cdc49e..1e0feb2 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -6,6 +6,8 @@ CIRCLE_STDLIB_DIR = ../circle-stdlib
 SYNTH_DEXED_DIR = ../Synth_Dexed/src
 CMSIS_DIR = ../CMSIS_5/CMSIS
 
+INCLUDE += -I../circle-stdlib/libs/circle-newlib/newlib/libc/include
+
 OBJS = main.o kernel.o minidexed.o config.o userinterface.o uimenu.o \
        mididevice.o midikeyboard.o serialmididevice.o pckeyboard.o \
        sysexfileloader.o performanceconfig.o perftimer.o \
@@ -15,4 +17,4 @@ OBJS = main.o kernel.o minidexed.o config.o userinterface.o uimenu.o \
 OPTIMIZE = -O3
 
 include ./Synth_Dexed.mk
-include ./Rules.mk
\ No newline at end of file
+include ./Rules.mk