diff --git a/compiler-rt/test/profile/Linux/corrupted-profile.c b/compiler-rt/test/profile/Linux/corrupted-profile.c
--- a/compiler-rt/test/profile/Linux/corrupted-profile.c
+++ b/compiler-rt/test/profile/Linux/corrupted-profile.c
@@ -42,10 +42,15 @@
     if (Buf == MAP_FAILED)
       bail("mmap");
 
+    // The binary IDs size is the 3rd uint64_t in the header. This size should
+    // already account for padding.
+    uint64_t BinaryIdsSize;
+    memcpy(&BinaryIdsSize, &Buf[2 * 8], sizeof(BinaryIdsSize));
+
     // We're trying to make the first CounterPtr invalid.
     // 11 64-bit words as header.
     // CounterPtr is the third 64-bit word field.
-    memset(&Buf[11 * 8 + 2 * 8], 0xAB, 8);
+    memset(&Buf[11 * 8 + BinaryIdsSize + 2 * 8], 0xAB, 8);
 
     if (munmap(Buf, FileSize))
       bail("munmap");