diff --git a/libc/bionic/malloc_debug_qemu.cpp b/libc/bionic/malloc_debug_qemu.cpp
index 08225c1..34ddb87 100644
--- a/libc/bionic/malloc_debug_qemu.cpp
+++ b/libc/bionic/malloc_debug_qemu.cpp
@@ -600,7 +600,7 @@
         error_log("Unable to open /dev/qemu_trace");
         return -1;
     } else {
-        qtrace = mmap(0, PAGESIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
+        qtrace = mmap(NULL, PAGESIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
         close(fd);
 
         if (qtrace == MAP_FAILED) {