diff --git a/clang/lib/Format/TokenAnnotator.cpp b/clang/lib/Format/TokenAnnotator.cpp
index 3a5510661200e..d7b84e309e096 100644
--- a/clang/lib/Format/TokenAnnotator.cpp
+++ b/clang/lib/Format/TokenAnnotator.cpp
@@ -2707,6 +2707,7 @@ class AnnotatingParser {
     auto IsQualifiedPointerOrReference = [this](FormatToken *T) {
       // This is used to handle cases such as x = (foo *const)&y;
       assert(!T->isTypeName(IsCpp) && "Should have already been checked");
+      (void)IsCpp; // Avoid -Wunused-lambda-capture when assertion is disabled.
       // Strip trailing qualifiers such as const or volatile when checking
       // whether the parens could be a cast to a pointer/reference type.
       while (T) {