diff --git a/compiler-rt/lib/scudo/standalone/wrappers_c_checks.h b/compiler-rt/lib/scudo/standalone/wrappers_c_checks.h
--- a/compiler-rt/lib/scudo/standalone/wrappers_c_checks.h
+++ b/compiler-rt/lib/scudo/standalone/wrappers_c_checks.h
@@ -49,7 +49,9 @@
 #if __has_builtin(__builtin_umull_overflow) && (SCUDO_WORDSIZE == 64U)
   return __builtin_umull_overflow(Size, N, Product);
 #elif __has_builtin(__builtin_umul_overflow) && (SCUDO_WORDSIZE == 32U)
-  return __builtin_umul_overflow(Size, N, Product);
+  // On, e.g. armv7, uptr/uintptr_t may be defined as unsigned long
+  return __builtin_umul_overflow(Size, N,
+                                 reinterpret_cast<unsigned int *>(Product));
 #else
   *Product = Size * N;
   if (!Size)