diff --git a/src/epics/util/lib/EXC.pm b/src/epics/util/lib/EXC.pm
index fa7cf32e2c17b6a67d88d8d158eb7bbfe78422c7..ba6913b201df77f528192a798022b511d29dbbf1 100644
--- a/src/epics/util/lib/EXC.pm
+++ b/src/epics/util/lib/EXC.pm
@@ -23,6 +23,7 @@ sub printHeaderStruct {
 	$::extraEXCmap{$key} = $::extraEXCcount;
 	$::extraEXCcount ++;
 	$::extraExcitations .= " $key";
+	return "";
 }
 
 # Print Epics variable definitions