diff --git a/radio/src/strhelpers.cpp b/radio/src/strhelpers.cpp
index 1ebc326fd..8dc14d4ba 100644
--- a/radio/src/strhelpers.cpp
+++ b/radio/src/strhelpers.cpp
@@ -452,10 +452,11 @@ char * strAppendUnsigned(char * dest, uint32_t value, uint8_t digits, uint8_t ra
     }
   }
   uint8_t idx = digits;
-  while(idx > 0) {
+  while (idx > 0) {
+    div_t qr = div(value, radix);
     uint32_t rem = value % radix;
-    dest[--idx] = (rem >= 10 ? 'A'-10 : '0') + rem;
-    value /= radix;
+    dest[--idx] = (qr.rem >= 10 ? 'A' - 10 : '0') + qr.rem;
+    value = qr.quot;
   }
   dest[digits] = '\0';
   return &dest[digits];