diff --git a/common/rfb/JpegDecompressor.cxx b/common/rfb/JpegDecompressor.cxx
index ca1ad22..70a4276 100644
--- a/common/rfb/JpegDecompressor.cxx
+++ b/common/rfb/JpegDecompressor.cxx
@@ -116,7 +116,7 @@
 
   if(setjmp(err->jmpBuffer)) {
     // this will execute if libjpeg has an error
-    throw rdr::Exception(err->lastError);
+    throw rdr::Exception("%s", err->lastError);
   }
 
   jpeg_create_decompress(dinfo);
@@ -162,7 +162,7 @@
     jpeg_abort_decompress(dinfo);
     if (dstBufIsTemp && dstBuf) delete[] dstBuf;
     if (rowPointer) delete[] rowPointer;
-    throw rdr::Exception(err->lastError);
+    throw rdr::Exception("%s", err->lastError);
   }
 
   src->pub.next_input_byte = jpegBuf;