diff --git a/stepmania/src/RageThreads.cpp b/stepmania/src/RageThreads.cpp
index ceac04dfff..f765d4b6b2 100644
--- a/stepmania/src/RageThreads.cpp
+++ b/stepmania/src/RageThreads.cpp
@@ -102,7 +102,7 @@ void ThreadSlot::ThreadCheckpoint::Set( const char *szFile, int iLine, const cha
 			m_szFile = p+1;
 	}
 
-	sprintf( m_szFormattedBuf, "        %s:%i %s", m_szFile, m_iLine, m_szMessage? m_szMessage:"" );
+	snprintf( m_szFormattedBuf, sizeof(m_szFormattedBuf), "        %s:%i %s", m_szFile, m_iLine, m_szMessage? m_szMessage:"" );
 }
 
 const char *ThreadSlot::ThreadCheckpoint::GetFormattedCheckpoint()