diff --git a/Makefile b/Makefile
index ebc5912a..d45ba16e 100644
--- a/Makefile
+++ b/Makefile
@@ -152,15 +152,6 @@ LDFLAGS += -T$(LDSCRIPT)
 
 #============================================================================
 
-# Define programs and commands
-#
-TOOLCHAIN = arm-none-eabi-
-CC       = $(TOOLCHAIN)gcc
-OBJCOPY  = $(TOOLCHAIN)objcopy
-OBJDUMP  = $(TOOLCHAIN)objdump
-SIZE     = $(TOOLCHAIN)size
-NM       = $(TOOLCHAIN)nm
-MKDIR    = mkdir
 POSTLD   = tools/add_version_info.py # -q
 
 # Compiler flags to generate dependency files
@@ -246,6 +237,7 @@ clean:
 # Include the base rules
 #
 include base.mak
+include toolchain.mak
 
 # Include the dependency files
 #
diff --git a/bootloader/Makefile b/bootloader/Makefile
index 5acc2585..59c7f57b 100644
--- a/bootloader/Makefile
+++ b/bootloader/Makefile
@@ -109,15 +109,6 @@ LDFLAGS += -T$(LDSCRIPT)
 
 #============================================================================
 
-# Define programs and commands
-#
-TOOLCHAIN = arm-none-eabi-
-CC       = $(TOOLCHAIN)gcc
-OBJCOPY  = $(TOOLCHAIN)objcopy
-OBJDUMP  = $(TOOLCHAIN)objdump
-SIZE     = $(TOOLCHAIN)size
-NM       = $(TOOLCHAIN)nm
-MKDIR    = mkdir
 POSTLD   = tools/add_version_info.py # -q
 
 # Compiler flags to generate dependency files
@@ -178,6 +169,7 @@ clean:
 # Include the base rules
 #
 include base.mak
+include toolchain.mak
 
 # Include the dependency files
 #
diff --git a/stm32f103/Makefile b/stm32f103/Makefile
index 09559d4d..7ae03d93 100644
--- a/stm32f103/Makefile
+++ b/stm32f103/Makefile
@@ -109,15 +109,6 @@ LDFLAGS += -T$(LDSCRIPT)
 
 #============================================================================
 
-# Define programs and commands
-#
-TOOLCHAIN = arm-none-eabi-
-CC       = $(TOOLCHAIN)gcc
-OBJCOPY  = $(TOOLCHAIN)objcopy
-OBJDUMP  = $(TOOLCHAIN)objdump
-SIZE     = $(TOOLCHAIN)size
-NM       = $(TOOLCHAIN)nm
-MKDIR    = mkdir
 POSTLD   = tools/add_version_info.py # -q
 
 # Compiler flags to generate dependency files
@@ -173,6 +164,7 @@ clean:
 # Include the base rules
 #
 include base.mak
+include toolchain.mak
 
 # Include the dependency files
 #
diff --git a/toolchain.mak b/toolchain.mak
new file mode 100644
index 00000000..e0c4504e
--- /dev/null
+++ b/toolchain.mak
@@ -0,0 +1,8 @@
+# Define programs and commands for the toolchain
+TOOLCHAIN = arm-none-eabi-
+CC       = $(TOOLCHAIN)gcc
+OBJCOPY  = $(TOOLCHAIN)objcopy
+OBJDUMP  = $(TOOLCHAIN)objdump
+SIZE     = $(TOOLCHAIN)size
+NM       = $(TOOLCHAIN)nm
+MKDIR    = mkdir