diff --git a/workspace/TS100/Makefile b/workspace/TS100/Makefile
index 20c43f58..175c1547 100644
--- a/workspace/TS100/Makefile
+++ b/workspace/TS100/Makefile
@@ -10,7 +10,6 @@ endif
 # Discover the source files to build
 SOURCE := $(shell find . -type f -name '*.c')
 SOURCE_CPP := $(shell find . -type f -name '*.cpp')
-SOURCES := $(shell find . -type f -name '*.c*')
 S_SRCS := $(shell find . -type f -name '*.s') 
 
 APP_INC_DIR = ./Core/Inc
@@ -47,7 +46,7 @@ HEXFILE_DIR=Hexfile
 OUTPUT_DIR=Objects
 
 # code optimisation ------------------------------------------------------------
-OPTIM=-Os -flto -ffat-lto-objects -finline-small-functions -findirect-inlining -fdiagnostics-color -ffunction-sections -fdata-sections
+OPTIM=-Os -flto -finline-small-functions -findirect-inlining -fdiagnostics-color -ffunction-sections -fdata-sections
 
 flash_size=64k
 bootldr_size=0x4000
@@ -64,7 +63,7 @@ DEBUG=-g3
 # Without debug code
 #DEBUG=
 
-	
+
 # libs -------------------------------------------------------------------------
 LIBS=
 
@@ -95,7 +94,9 @@ LINKER_FLAGS=-Wl,--gc-sections 		\
 			-Wl,--wrap=free \
 			-o$(OUT_HEXFILE).elf 	\
 			-Wl,-Map=$(OUT_HEXFILE).map \
-			-lm -Wl,--undefined=vTaskSwitchContext \
+			-lm \
+			-Wl,--undefined=vTaskSwitchContext \
+			-Wl,--undefined=pxCurrentTCB \
 			-Wl,--defsym=__FLASH_SIZE__=$(flash_size) \
 			-Wl,--defsym=__BOOTLDR_SIZE__=$(bootldr_size) \
 			--specs=nano.specs