diff --git a/src/gui/text/qfontengine.cpp b/src/gui/text/qfontengine.cpp
index 400ce8366f..0f0ad290fd 100644
--- a/src/gui/text/qfontengine.cpp
+++ b/src/gui/text/qfontengine.cpp
@@ -1364,8 +1364,7 @@ bool QFontEngineMulti::stringToCMap(const QChar *str, int len,
                                     QGlyphLayout *glyphs, int *nglyphs,
                                     QFontEngine::ShaperFlags flags) const
 {
-    int ng = *nglyphs;
-    if (!engine(0)->stringToCMap(str, len, glyphs, &ng, flags))
+    if (!engine(0)->stringToCMap(str, len, glyphs, nglyphs, flags))
         return false;
 
     const_cast<QFontEngineMulti *>(this)->ensureFallbackFamiliesQueried();
@@ -1415,8 +1414,8 @@ bool QFontEngineMulti::stringToCMap(const QChar *str, int len,
         ++glyph_pos;
     }
 
-    *nglyphs = ng;
-    glyphs->numGlyphs = ng;
+    *nglyphs = glyph_pos;
+    glyphs->numGlyphs = glyph_pos;
 
     return true;
 }