diff --git a/src/targets/STM32/Pins_STM32.h b/src/targets/STM32/Pins_STM32.h
index f75ebea856..6a06a06fee 100644
--- a/src/targets/STM32/Pins_STM32.h
+++ b/src/targets/STM32/Pins_STM32.h
@@ -47,7 +47,7 @@
 
 #  define IAP_IMAGE_START         0x0                 // FIXME: Needs updating for H7
 # else
-#  error "Processor undfined"
+#  error "Processor undefined"
 # endif
 #else
 # define FIRMWARE_NAME "RepRapFirmware for STM32F4 based Boards"
@@ -578,4 +578,4 @@ namespace StepPins
     }
 }
 
-#endif
\ No newline at end of file
+#endif