diff --git a/radiant/build.cpp b/radiant/build.cpp
index 75c10da8..74805a6f 100644
--- a/radiant/build.cpp
+++ b/radiant/build.cpp
@@ -494,7 +494,8 @@ void build_run( const char* name, CommandListener& listener ){
 			{
 				StringBuffer output;
 				( *j ).evaluate( output );
-				listener.execute( output.c_str() );
+				if ( !output.empty() )
+					listener.execute( output.c_str() );
 			}
 		}
 		else