diff --git a/clang-tools-extra/pseudo/lib/cxx.bnf b/clang-tools-extra/pseudo/lib/cxx.bnf
--- a/clang-tools-extra/pseudo/lib/cxx.bnf
+++ b/clang-tools-extra/pseudo/lib/cxx.bnf
@@ -713,7 +713,7 @@
 #! so it doesn't belong to the grammar. However, we extend the grammar to
 #! support it, to make the pseudoparser fully functional on practical code.
 string-literal := string-literal-chunk
-string-literal := string-literal string-literal-chunk
+string-literal := string-literal-chunk string-literal
 user-defined-literal := user-defined-integer-literal
 user-defined-literal := user-defined-floating-point-literal
 user-defined-literal := user-defined-string-literal
@@ -726,7 +726,6 @@
 user-defined-string-literal-chunk := UTF32_STRING_LITERAL
 user-defined-string-literal := user-defined-string-literal-chunk
 user-defined-string-literal := string-literal-chunk user-defined-string-literal
-user-defined-string-literal := user-defined-string-literal string-literal-chunk
 user-defined-floating-point-literal := NUMERIC_CONSTANT
 user-defined-character-literal := CHAR_CONSTANT
 user-defined-character-literal := WIDE_CHAR_CONSTANT