+--- jemalloc-5.2.0/include/jemalloc/internal/bit_util.h.orig 2019-04-28 14:32:25.888211875 +0200
++++ jemalloc-5.2.0/include/jemalloc/internal/bit_util.h 2019-04-28 14:32:29.508401674 +0200
+@@ -86,13 +86,14 @@
+ if(unlikely(x <= 1)) {
+ return x;
+ }
+- size_t msb_on_index;
+ #if (defined(__amd64__) || defined(__x86_64__))
++ uint64_t msb_on_index;
+ asm ("bsrq %1, %0"
+ : "=r"(msb_on_index) // Outputs.
+ : "r"(x-1) // Inputs.
+ );
+ #elif (defined(JEMALLOC_HAVE_BUILTIN_CLZ))
++ size_t msb_on_index;
+ msb_on_index = (63 ^ __builtin_clzll(x - 1));
+ #endif
+ assert(msb_on_index < 63);