diff --git a/scripts/Makefile.toolchain.iamcu b/scripts/Makefile.toolchain.iamcu
index 88ae283b30a..4cf70c2a119 100644
--- a/scripts/Makefile.toolchain.iamcu
+++ b/scripts/Makefile.toolchain.iamcu
@@ -5,17 +5,20 @@ endif
 CROSS_COMPILE_TARGET_x86 = i586-intel-elfiamcu
 CROSS_COMPILE_x86_version = 4.9.3
 CROSS_COMPILE_x86=${IAMCU_TOOLCHAIN_PATH}/bin/${CROSS_COMPILE_TARGET_x86}-
+TOOLCHAIN_CFLAGS_x86 = -I${IAMCU_TOOLCHAIN_PATH}/$(CROSS_COMPILE_TARGET_x86)/include/
 
 CROSS_COMPILE= $(CROSS_COMPILE_$(ARCH))
 
 LIB_INCLUDE_DIR_x86 = -L $(IAMCU_TOOLCHAIN_PATH)/lib/gcc/$(CROSS_COMPILE_TARGET_x86)/$(CROSS_COMPILE_x86_version)
+LIB_INCLUDE_DIR_x86 += -L ${IAMCU_TOOLCHAIN_PATH}/$(CROSS_COMPILE_TARGET_x86)/lib
 
 LIB_INCLUDE_DIR = $(LIB_INCLUDE_DIR_$(ARCH))
 
 TOOLCHAIN_LIBS = gcc
+TOOLCHAIN_CFLAGS = $(TOOLCHAIN_CFLAGS_$(ARCH))
 
 LD_TOOLCHAIN ?= -D__GCC_LINKER_CMD__ -D__IAMCU
 OUTPUT_FORMAT = elf32-iamcu
 OUTPUT_ARCH = iamcu:intel
 
-export CROSS_COMPILE TOOLCHAIN_LIBS LIB_INCLUDE_DIR
+export CROSS_COMPILE TOOLCHAIN_LIBS LIB_INCLUDE_DIR TOOLCHAIN_CFLAGS