diff --git a/vendored/libfuse/lib/fuse_opt.cpp b/vendored/libfuse/lib/fuse_opt.cpp
index 1cf34b20..07eca268 100644
--- a/vendored/libfuse/lib/fuse_opt.cpp
+++ b/vendored/libfuse/lib/fuse_opt.cpp
@@ -233,7 +233,10 @@ process_opt_param(void       *var,
     }
   else
     {
-      if(sscanf(param, format, static_cast<int*>(var)) != 1)
+      int rv;
+
+      rv = sscanf(param, format, static_cast<int*>(var));
+      if(rv != 1)
         {
           fprintf(stderr,"mergerfs: invalid parameter in option `%s'\n",arg);
           return -1;