diff --git a/libc/utils/FPUtil/FloatProperties.h b/libc/utils/FPUtil/FloatProperties.h
--- a/libc/utils/FPUtil/FloatProperties.h
+++ b/libc/utils/FPUtil/FloatProperties.h
@@ -151,7 +151,7 @@
 
 template <> struct FloatType<__uint128_t> {
   static_assert(sizeof(__uint128_t) == sizeof(long double),
-                "Unexpected size of 'double' type.");
+                "Unexpected size of 'long double' type.");
   typedef long double Type;
 };