diff --git a/libc/malloc_debug/Config.cpp b/libc/malloc_debug/Config.cpp
index ded618c..cc60086 100644
--- a/libc/malloc_debug/Config.cpp
+++ b/libc/malloc_debug/Config.cpp
@@ -273,7 +273,7 @@
   fill_free_value = DEFAULT_FILL_FREE_VALUE;
   front_guard_value = DEFAULT_FRONT_GUARD_VALUE;
   rear_guard_value = DEFAULT_REAR_GUARD_VALUE;
-  backtrace_signal = SIGRTMIN + 10;
+  backtrace_signal = SIGRTMAX - 19;
   free_track_backtrace_num_frames = 16;
 
   // Parse the options are of the format:
diff --git a/libc/malloc_debug/FreeTrackData.cpp b/libc/malloc_debug/FreeTrackData.cpp
index 682f93d..8e6502e 100644
--- a/libc/malloc_debug/FreeTrackData.cpp
+++ b/libc/malloc_debug/FreeTrackData.cpp
@@ -48,7 +48,7 @@
   uint8_t fill_free_value = debug_->config().fill_free_value;
   for (size_t i = 0; i < header->usable_size; i++) {
     if (pointer[i] != fill_free_value) {
-      error_log("  pointer[%zu] = 0x%02x (expected 0x%02x)", i, pointer[i], fill_free_value);
+      error_log("  allocation[%zu] = 0x%02x (expected 0x%02x)", i, pointer[i], fill_free_value);
     }
   }
   auto back_iter = backtraces_.find(header);
diff --git a/libc/malloc_debug/GuardData.cpp b/libc/malloc_debug/GuardData.cpp
index 48961b6..e207b86 100644
--- a/libc/malloc_debug/GuardData.cpp
+++ b/libc/malloc_debug/GuardData.cpp
@@ -57,7 +57,7 @@
   const uint8_t* real = reinterpret_cast<const uint8_t*>(data);
   for (size_t i = 0; i < cmp_mem_.size(); i++, pointer_idx++) {
     if (real[i] != expected[i]) {
-      error_log("  pointer[%d] = 0x%02x (expected 0x%02x)", pointer_idx, real[i], expected[i]);
+      error_log("  allocation[%d] = 0x%02x (expected 0x%02x)", pointer_idx, real[i], expected[i]);
     }
   }