diff --git a/src/link/SpirV.zig b/src/link/SpirV.zig
index 0cc238f140aff7edecac77de18e0d0dfece02479..6577b0df515cb5ca9fd7280201b442173db2e909 100644
--- a/src/link/SpirV.zig
+++ b/src/link/SpirV.zig
@@ -232,6 +232,7 @@ pub fn flushModule(self: *SpirV, arena: Allocator, prog_node: std.Progress.Node)
         // name if it contains no strange characters is nice for debugging. URI encoding fits the bill.
         // We're using : as separator, which is a reserved character.
 
+        try error_info.append(':');
         try std.Uri.Component.percentEncode(
             error_info.writer(),
             name.toSlice(&mod.intern_pool),