diff --git a/lib/EpdFont/SdCardFont.cpp b/lib/EpdFont/SdCardFont.cpp
index 2a3329da..7bd75baa 100644
--- a/lib/EpdFont/SdCardFont.cpp
+++ b/lib/EpdFont/SdCardFont.cpp
@@ -1097,13 +1097,17 @@ int SdCardFont::buildAdvanceTable(const char* utf8Text, uint8_t styleMask) {
 
     uint32_t needCount = 0;
     uint32_t missedThisStyle = 0;
+    const int32_t replacementIdx = findGlobalGlyphIndex(s, REPLACEMENT_GLYPH);
     for (uint32_t i = 0; i < cpCount; i++) {
       const uint32_t cp = codepoints[i];
       if (advanceTableLookup(si, cp, nullptr)) continue;  // already cached
       int32_t idx = findGlobalGlyphIndex(s, cp);
       if (idx < 0) {
-        missedThisStyle++;
-        continue;
+        if (replacementIdx < 0) {
+          missedThisStyle++;
+          continue;
+        }
+        idx = replacementIdx;
       }
       mappings[needCount].codepoint = cp;
       mappings[needCount].glyphIndex = idx;