diff --git a/src/AstGen.zig b/src/AstGen.zig
index 8e6721d7bc..422827c673 100644
--- a/src/AstGen.zig
+++ b/src/AstGen.zig
@@ -4233,13 +4233,10 @@ fn structDeclInner(
     // are in scope, so that field types, alignments, and default value expressions
     // can refer to decls within the struct itself.
     astgen.advanceSourceCursorToNode(node);
-    // If `node == 0` then this is the root struct and all the declarations should
-    // be relative to the beginning of the file.
-    const decl_line = if (node == 0) 0 else astgen.source_line;
     var block_scope: GenZir = .{
         .parent = &namespace.base,
         .decl_node_index = node,
-        .decl_line = decl_line,
+        .decl_line = gz.decl_line,
         .astgen = astgen,
         .force_comptime = true,
         .instructions = gz.instructions,
@@ -4439,7 +4436,7 @@ fn unionDeclInner(
     var block_scope: GenZir = .{
         .parent = &namespace.base,
         .decl_node_index = node,
-        .decl_line = astgen.source_line,
+        .decl_line = gz.decl_line,
         .astgen = astgen,
         .force_comptime = true,
         .instructions = gz.instructions,
@@ -4722,7 +4719,7 @@ fn containerDecl(
             var block_scope: GenZir = .{
                 .parent = &namespace.base,
                 .decl_node_index = node,
-                .decl_line = astgen.source_line,
+                .decl_line = gz.decl_line,
                 .astgen = astgen,
                 .force_comptime = true,
                 .instructions = gz.instructions,
@@ -4827,7 +4824,7 @@ fn containerDecl(
             var block_scope: GenZir = .{
                 .parent = &namespace.base,
                 .decl_node_index = node,
-                .decl_line = astgen.source_line,
+                .decl_line = gz.decl_line,
                 .astgen = astgen,
                 .force_comptime = true,
                 .instructions = gz.instructions,