diff --git a/stepmania/src/Course.cpp b/stepmania/src/Course.cpp
index f794652f7b..d89f862b55 100644
--- a/stepmania/src/Course.cpp
+++ b/stepmania/src/Course.cpp
@@ -591,7 +591,8 @@ Trail* Course::GetTrail( StepsType st, CourseDifficulty cd ) const
 			SortTrail = trail;
 		else
 			GetTrailUnsorted( st, COURSE_DIFFICULTY_REGULAR, SortTrail );
-		ASSERT_M( trail.m_vEntries.size() == SortTrail.m_vEntries.size(), ssprintf("%i %i", trail.m_vEntries.size(), SortTrail.m_vEntries.size()) );
+		ASSERT_M( trail.m_vEntries.size() == SortTrail.m_vEntries.size(),
+                  ssprintf("%i %i", int(trail.m_vEntries.size()), int(SortTrail.m_vEntries.size())) );
 
 		vector<SortTrailEntry> entries;
 		for( unsigned i = 0; i < trail.m_vEntries.size(); ++i )