diff --git a/ion/src/device/device.cpp b/ion/src/device/device.cpp
index 92df7404a..a71efd04f 100644
--- a/ion/src/device/device.cpp
+++ b/ion/src/device/device.cpp
@@ -59,10 +59,15 @@ void initFPU() {
 
 void init() {
   initClocks();
+#ifndef DEBUG
+  /* In debug mode, we want to keep the SWD port configured as such.
+   * In release mode, we're setting all the inputs to analog, non-pulled state
+   * to save power. */
   for (int g=0; g<5; g++) {
     GPIO(g).MODER()->set(0xFFFFFFFF); // All to "Analog"
     GPIO(g).PUPDR()->set(0x00000000); // All to "None"
   }
+#endif
   initPeripherals();
 }