diff --git a/STM32F1XX/boards.txt b/STM32F1XX/boards.txt
index a83fac6..6f3d81e 100644
--- a/STM32F1XX/boards.txt
+++ b/STM32F1XX/boards.txt
@@ -324,7 +324,7 @@ microduino32_flash.upload.file_type=bin
 microduino32_flash.upload.ram.maximum_size=17000
 microduino32_flash.upload.flash.maximum_size=108000
 microduino32_flash.upload.usbID=1EAF:0003
-microduino32_flash.upload.altID=0
+microduino32_flash.upload.altID=1
 microduino32_flash.upload.auto_reset=true
 
 
diff --git a/STM32F1XX/platform.txt b/STM32F1XX/platform.txt
index a2f2bb3..d0352ea 100644
--- a/STM32F1XX/platform.txt
+++ b/STM32F1XX/platform.txt
@@ -97,10 +97,12 @@ recipe.size.regex.data=^(?:\.data|\.bss|\.noinit)\s+([0-9]+).*
 # Uploader tools
 # -------------------
 
+# Upload using Maple bootloader over DFU
 tools.maple_upload.cmd=maple_upload
 tools.maple_upload.cmd.windows=maple_upload.bat
 #tools.maple_upload.cmd.linux=
 tools.maple_upload.path={runtime.hardware.path}/tools/win
+tools.maple_upload.path.macosx={runtime.hardware.path}/tools/macosx
 
 tools.maple_upload.upload.params.verbose=-d
 tools.maple_upload.upload.params.quiet=
diff --git a/tools/macosx/maple_upload b/tools/macosx/maple_upload
new file mode 100755
index 0000000..0244596
--- /dev/null
+++ b/tools/macosx/maple_upload
@@ -0,0 +1,17 @@
+#!/bin/bash
+
+set -e
+
+if [ $# -lt 4 ]; then
+    echo "Usage: $0 $# <dummy_port> <altID> <usbID> <binfile>" >&2
+    exit 1
+fi
+dummy_port=$1; altID=$2; usbID=$3; binfile=$4
+
+DFU_UTIL=/opt/local/bin/dfu-util
+if [ ! -x ${DFU_UTIL} ]; then
+    echo "$0: error: cannot find ${DFU_UTIL}" >&2
+    exit 2
+fi
+
+${DFU_UTIL} -d ${usbID} -a ${altID} -D ${binfile}