diff --git a/compiler-rt/lib/profile/InstrProfilingPlatformFuchsia.c b/compiler-rt/lib/profile/InstrProfilingPlatformFuchsia.c
--- a/compiler-rt/lib/profile/InstrProfilingPlatformFuchsia.c
+++ b/compiler-rt/lib/profile/InstrProfilingPlatformFuchsia.c
@@ -52,7 +52,7 @@
   int ret = vsnprintf(s, sizeof(s), fmt, ap);
   va_end(ap);
 
-  __sanitizer_log_write(s, ret + 1);
+  __sanitizer_log_write(s, ret);
 }
 
 struct lprofVMOWriterCtx {