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-rw-r--r--compiler/ccgtypes.nim4
1 files changed, 3 insertions, 1 deletions
diff --git a/compiler/ccgtypes.nim b/compiler/ccgtypes.nim
index 59fbfc3e1..dd79f4846 100644
--- a/compiler/ccgtypes.nim
+++ b/compiler/ccgtypes.nim
@@ -449,7 +449,9 @@ proc genRecordFieldsAux(m: BModule, n: PNode,
   of nkRecCase:
     if n.sons[0].kind != nkSym: internalError(m.config, n.info, "genRecordFieldsAux")
     add(result, genRecordFieldsAux(m, n.sons[0], accessExpr, rectype, check))
-    let uname = rope(mangle(n.sons[0].sym.name.s) & 'U')
+    # prefix mangled name with "_U" to avoid clashes with other field names,
+    # since identifiers are not allowed to start with '_'
+    let uname = rope("_U" & mangle(n.sons[0].sym.name.s))
     let ae = if accessExpr != nil: "$1.$2" % [accessExpr, uname]
              else: uname
     var unionBody: Rope = nil