diff --git a/examples/stm32/f1/Makefile.include b/examples/stm32/f1/Makefile.include
index 0b7af7b..919d918 100644
--- a/examples/stm32/f1/Makefile.include
+++ b/examples/stm32/f1/Makefile.include
@@ -27,7 +27,7 @@ OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
 
 TOOLCHAIN_DIR ?= ../../../../../libopencm3
-ifeq ($(wildcard ../../../../../libopencm3/lib/libopencm3_stm32f1.a),)
+ifeq ($(wildcard $(TOOLCHAIN_DIR)/lib/libopencm3_stm32f1.a),)
 ifneq ($(strip $(shell which $(CC))),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 endif
diff --git a/examples/stm32/f2/Makefile.include b/examples/stm32/f2/Makefile.include
index 209ab4b..e8ec423 100644
--- a/examples/stm32/f2/Makefile.include
+++ b/examples/stm32/f2/Makefile.include
@@ -28,7 +28,7 @@ OBJDUMP		= $(PREFIX)-objdump
 GDB		= $(PREFIX)-gdb
 
 TOOLCHAIN_DIR ?= ../../../../../libopencm3
-ifeq ($(wildcard ../../../../../libopencm3/lib/libopencm3_stm32f2.a),)
+ifeq ($(wildcard $(TOOLCHAIN_DIR)/lib/libopencm3_stm32f2.a),)
 ifneq ($(strip $(shell which $(CC))),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 endif
diff --git a/examples/stm32/f3/Makefile.include b/examples/stm32/f3/Makefile.include
index 6bfeead..d52af29 100644
--- a/examples/stm32/f3/Makefile.include
+++ b/examples/stm32/f3/Makefile.include
@@ -29,7 +29,7 @@ GDB		= $(PREFIX)-gdb
 FLASH		= $(shell which st-flash)
 
 TOOLCHAIN_DIR ?= ../../../../../libopencm3
-ifeq ($(wildcard ../../../../../libopencm3/lib/libopencm3_stm32f3.a),)
+ifeq ($(wildcard $(TOOLCHAIN_DIR)/lib/libopencm3_stm32f3.a),)
 ifneq ($(strip $(shell which $(CC))),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 endif
diff --git a/examples/stm32/f4/Makefile.include b/examples/stm32/f4/Makefile.include
index eebbeab..4d8bc2d 100644
--- a/examples/stm32/f4/Makefile.include
+++ b/examples/stm32/f4/Makefile.include
@@ -29,7 +29,7 @@ GDB		= $(PREFIX)-gdb
 FLASH		= $(shell which st-flash)
 
 TOOLCHAIN_DIR ?= ../../../../../libopencm3
-ifeq ($(wildcard ../../../../../libopencm3/lib/libopencm3_stm32f4.a),)
+ifeq ($(wildcard $(TOOLCHAIN_DIR)/lib/libopencm3_stm32f4.a),)
 ifneq ($(strip $(shell which $(CC))),)
 TOOLCHAIN_DIR := $(shell dirname `which $(CC)`)/../$(PREFIX)
 endif