diff --git a/src/backends/pgfplotsx.jl b/src/backends/pgfplotsx.jl
index 3cc9114b..32a75c6d 100644
--- a/src/backends/pgfplotsx.jl
+++ b/src/backends/pgfplotsx.jl
@@ -521,7 +521,7 @@ function pgfx_add_series!(::Val{:mesh3d}, axis, series_opt, series, series_func,
     elseif typeof(opt[:connections]) <: AbstractVector{NTuple{3, Int}}
         # 1-based indexing
         ptable = join(
-            [string(i, " ", j, " ", k, "\\\\") for (i, j, k) in opt[:connections]],
+            [string(i-1, " ", j-1, " ", k-1, "\\\\") for (i, j, k) in opt[:connections]],
             "\n        ",
         )
     else