Index: src/assuan-buffer.c
===================================================================
--- src/assuan-buffer.c
+++ src/assuan-buffer.c
@@ -61,7 +61,7 @@
   *r_nread = 0;
   while (nleft > 0)
     {
-      ssize_t n = ctx->io->read (ctx, buf, nleft);
+      ssize_t n = (ctx->io->read) (ctx, buf, nleft);
 
       if (n < 0)
         {