diff --git a/radio/src/gui/menu_general.cpp b/radio/src/gui/menu_general.cpp
index 086fe5730..34f9cb124 100644
--- a/radio/src/gui/menu_general.cpp
+++ b/radio/src/gui/menu_general.cpp
@@ -859,12 +859,7 @@ void onSdManagerMenu(const char *result)
 #endif
 #if defined(PCBTARANIS)
   else if (result == STR_ASSIGN_BITMAP) {
-    strcpy(lfn, reusableBuffer.sdmanager.lines[index]);
-    // TODO duplicated code for finding extension
-    uint8_t len = strlen(lfn) - 4;
-    memset(lfn+len, 0, sizeof(g_model.header.bitmap)-len);
-    // TODO duplicated code
-    memcpy(g_model.header.bitmap, lfn, sizeof(g_model.header.bitmap));
+    strAppendFilename(g_model.header.bitmap, reusableBuffer.sdmanager.lines[index], sizeof(g_model.header.bitmap));
     LOAD_MODEL_BITMAP();
     memcpy(modelHeaders[g_eeGeneral.currModel].bitmap, g_model.header.bitmap, sizeof(g_model.header.bitmap));
     eeDirty(EE_MODEL);
@@ -983,7 +978,8 @@ void menuGeneralSdManager(uint8_t _event)
         uint8_t index = m_posVert-1-s_pgOfs;
         // TODO duplicated code for finding extension
         char * ext = reusableBuffer.sdmanager.lines[index];
-        ext += strlen(ext) - 4;
+        int len = strlen(ext) - 4;
+        ext += len;
         /* TODO if (!strcasecmp(ext, MODELS_EXT)) {
           s_menu[s_menu_count++] = STR_LOAD_FILE;
         }
@@ -992,7 +988,7 @@ void menuGeneralSdManager(uint8_t _event)
         }
 #endif
 #if defined(PCBTARANIS)
-        else if (!strcasecmp(ext, BITMAPS_EXT) && !READ_ONLY()) {
+        else if (!strcasecmp(ext, BITMAPS_EXT) && !READ_ONLY() && len <= (int)sizeof(g_model.header.bitmap)) {
           MENU_ADD_ITEM(STR_ASSIGN_BITMAP);
         }
         else if (!strcasecmp(ext, TEXT_EXT)) {
diff --git a/radio/src/lcd.h b/radio/src/lcd.h
index 4c9156c68..f32dafea9 100644
--- a/radio/src/lcd.h
+++ b/radio/src/lcd.h
@@ -299,5 +299,6 @@ void lcdSetContrast();
 
 char * strAppend(char * dest, const char * source);
 char * strAppendDate(char * str, bool time=false);
+char * strAppendFilename(char * dest, const char * filename, const int size);
 
 #endif
diff --git a/radio/src/strhelpers.cpp b/radio/src/strhelpers.cpp
index c0868b66b..b09994aae 100755
--- a/radio/src/strhelpers.cpp
+++ b/radio/src/strhelpers.cpp
@@ -151,6 +151,18 @@ char * strAppend(char * dest, const char * source)
   return dest - 1;
 }
 
+char * strAppendFilename(char * dest, const char * filename, const int size)
+{
+  memset(dest, 0, size);
+  for (int i=0; i<size; i++) {
+    char c = *filename++;
+    if (c == '\0' || c == '.')
+      break;
+    *dest++ = c;
+  }
+  return dest;
+}
+
 #if defined(RTCLOCK)
 #include "rtc.h"