diff --git a/libc/include/llvm-libc-macros/cfloat128-macros.h b/libc/include/llvm-libc-macros/cfloat128-macros.h
index 5f28cfa21aae..ff4aa530685d 100644
--- a/libc/include/llvm-libc-macros/cfloat128-macros.h
+++ b/libc/include/llvm-libc-macros/cfloat128-macros.h
@@ -27,7 +27,7 @@
 #define LIBC_TYPES_HAS_CFLOAT128
 #endif
 #elif defined(__GNUC__)
-#if (defined(__STDC_IEC_60559_COMPLEX__) || defined(__SIZEOF_FLOAT128__)) &&   \
+#if (defined(__STDC_IEC_60559_COMPLEX__) && defined(__SIZEOF_FLOAT128__)) &&   \
     (__GNUC__ >= 13 || (!defined(__cplusplus)))
 #define LIBC_TYPES_HAS_CFLOAT128
 #endif