diff --git a/runtime.pl b/runtime.pl
index 36a2e5475..0e77174b3 100644
--- a/runtime.pl
+++ b/runtime.pl
@@ -164,15 +164,15 @@ sub c_params {
 my $autogenerated=
 "/***** Autogenerated from $prefix.in; changes will be overwritten *****/\n\n";
 
-my $base_source_line = 1;
+my $basesource_line = 1;
 my $source_line = 1;
 
 print $autogenerated;
 
-print "#line $base_source_line \"$srcTemplateDir/runtimebase.in\"\n";
+print "#line $basesource_line \"$srcTemplateDir/runtimebase.in\"\n";
 my $baseheader = <BASE>;
 print $baseheader;
-my $basesource_line += ($baseheader =~ tr/\n//);;
+$basesource_line += ($baseheader =~ tr/\n//);;
 my $basesource_type_line = $basesource_line;
 
 print "#line $source_line \"$srcTemplateDir/$prefix.in\"\n";
@@ -187,7 +187,7 @@ sub c_params {
 my $types = <>;
 $source_line += ($types =~ tr/\n//);;
 
-print "#line $base_source_line \"$srcTemplateDir/runtimebase.in\"\n";
+print "#line $basesource_line \"$srcTemplateDir/runtimebase.in\"\n";
 $baseheader = <BASE>;
 print $baseheader;
 $basesource_line += ($baseheader =~ tr/\n//);;