diff --git a/scripts/recaser/detruecase.perl b/scripts/recaser/detruecase.perl
index 66ca24fa2..884ebe3df 100755
--- a/scripts/recaser/detruecase.perl
+++ b/scripts/recaser/detruecase.perl
@@ -83,6 +83,7 @@ sub process {
 	print $_;
     }
     print "\n";
+    STDOUT->flush;
     $sentence++;
 }
 
diff --git a/scripts/recaser/truecase.perl b/scripts/recaser/truecase.perl
index cdff621ae..64bf787fa 100755
--- a/scripts/recaser/truecase.perl
+++ b/scripts/recaser/truecase.perl
@@ -82,6 +82,7 @@ while(<STDIN>) {
   }
   print $$MARKUP[$#$MARKUP];
   print "\n";
+  STDOUT->flush
 }
 
 # store away xml markup
diff --git a/scripts/tokenizer/detokenizer.perl b/scripts/tokenizer/detokenizer.perl
index 41299baf2..9bc6245f3 100755
--- a/scripts/tokenizer/detokenizer.perl
+++ b/scripts/tokenizer/detokenizer.perl
@@ -64,6 +64,7 @@ while(<STDIN>) {
   } else {
 		print &detokenize($_);
 	}
+	STDOUT->flush
 }
 
 
diff --git a/scripts/tokenizer/tokenizer.perl b/scripts/tokenizer/tokenizer.perl
index b84b9eb31..c3014928b 100755
--- a/scripts/tokenizer/tokenizer.perl
+++ b/scripts/tokenizer/tokenizer.perl
@@ -186,6 +186,7 @@ else
         {
             print &tokenize($_);
         }
+        STDOUT->flush
     }
 }