diff --git a/Makefile b/Makefile
index 18a4669..9b9b4b2 100644
--- a/Makefile
+++ b/Makefile
@@ -47,9 +47,9 @@ obj = $(addprefix $(BUILD)/, $(obj-y))
 -include $(obj:.o=.d)
 
 # Set up the toolchain.
-CC := $(PREFIX)-gcc
-LD := $(PREFIX)-gcc
-GDB := $(PREFIX)-gdb
+CC := $(PREFIX)gcc
+LD := $(PREFIX)gcc
+GDB := $(PREFIX)gdb
 MAKE := make
 
 .SECONDARY:
diff --git a/scripts/Makefile.stm32f0 b/scripts/Makefile.stm32f0
index 9070df3..6b33d73 100644
--- a/scripts/Makefile.stm32f0
+++ b/scripts/Makefile.stm32f0
@@ -1,4 +1,4 @@
-PREFIX ?= arm-none-eabi
+PREFIX ?= arm-none-eabi-
 
 LDSCRIPT = support/stm32f0-discovery.ld