diff --git a/include/tclap/StdOutput.h b/include/tclap/StdOutput.h
index e357cef..0162cb3 100644
--- a/include/tclap/StdOutput.h
+++ b/include/tclap/StdOutput.h
@@ -237,7 +237,7 @@ inline void StdOutput::spacePrint( std::ostream& os,
 		while ( start < len )
 		{
 			// find the substring length
-			int stringLen = std::min( len - start, allowedLen );
+			int stringLen = std::min<int>( len - start, allowedLen );
 
 			// trim the length so it doesn't end in middle of a word
 			if ( stringLen == allowedLen )