diff --git a/basegfx/source/polygon/b2dsvgpolypolygon.cxx b/basegfx/source/polygon/b2dsvgpolypolygon.cxx
index 2fdacad3653f..490bcd69c9a6 100644
--- a/basegfx/source/polygon/b2dsvgpolypolygon.cxx
+++ b/basegfx/source/polygon/b2dsvgpolypolygon.cxx
@@ -648,7 +648,7 @@ namespace basegfx
                     default:
                     {
                         SAL_WARN("basegfx", "importFromSvgD(): skipping tags in svg:d element (unknown: \""
-                                << aCurrChar
+                                << OUString(aCurrChar)
                                 << "\")!");
                         ++nPos;
                         break;
diff --git a/starmath/source/ooxmlimport.cxx b/starmath/source/ooxmlimport.cxx
index f0913f157078..731daa054120 100644
--- a/starmath/source/ooxmlimport.cxx
+++ b/starmath/source/ooxmlimport.cxx
@@ -223,7 +223,7 @@ OUString SmOoxmlImport::handleAcc()
             break;
         default:
             acc = "acute";
-            SAL_WARN( "starmath.ooxml", "Unknown m:chr in m:acc \'" << accChr << "\'" );
+            SAL_WARN( "starmath.ooxml", "Unknown m:chr in m:acc \'" << OUString(accChr) << "\'" );
             break;
     }
     OUString e = readOMathArgInElement( M_TOKEN( e ));
@@ -554,7 +554,7 @@ OUString SmOoxmlImport::handleNary()
             ret = "sum";
             break;
         default:
-            SAL_WARN( "starmath.ooxml", "Unknown m:nary chr \'" << chr << "\'" );
+            SAL_WARN( "starmath.ooxml", "Unknown m:nary chr \'" << OUString(chr) << "\'" );
             break;
     }
     if( !subHide )