diff -r 77021e06b1a8 -r 19d1a8422f6e src/cx/utils.h
--- a/src/cx/utils.h	Tue Feb 07 20:08:45 2023 +0100
+++ b/src/cx/utils.h	Tue Feb 07 21:37:55 2023 +0100
@@ -56,9 +56,8 @@
 #if (__GNUC__ >= 5 || defined(__clang__)) && !defined(CX_NO_SZMUL_BUILTIN)
 #define CX_SZMUL_BUILTIN
 
-#if __WORDSIZE == 32
 /**
- * Alias for \c __builtin_umull_overflow.
+ * Alias for \c __builtin_mul_overflow.
  *
  * Performs a multiplication of size_t values and checks for overflow.
  *
@@ -69,22 +68,7 @@
  * @return zero, if no overflow occurred and the result is correct, non-zero
  * otherwise
  */
-#define cx_szmul(a, b, result) __builtin_umull_overflow(a, b, result)
-#else // __WORDSIZE != 32
-/**
- * Alias for \c __builtin_umulll_overflow.
- *
- * Performs a multiplication of size_t values and checks for overflow.
- *
- * @param a first operand
- * @param b second operand
- * @param result a pointer to a size_t, where the result should
- * be stored
- * @return zero, if no overflow occurred and the result is correct, non-zero
- * otherwise
- */
-#define cx_szmul(a, b, result) __builtin_umulll_overflow(a, b, result)
-#endif // __WORDSIZE
+#define cx_szmul(a, b, result) __builtin_mul_overflow(a, b, result)
 
 #else // no GNUC or clang bultin