diff --git a/interpol_param.pro b/interpol_param.pro
index 682f24f3459191e4e41613b2b69b6e16a7c9374c..e080abb4a93a18990425c186c3aa7036d1189040 100644
--- a/interpol_param.pro
+++ b/interpol_param.pro
@@ -32,5 +32,5 @@ function interpol_param, table, par_name, date, empty_params = empty_params
 	  	journal, 'Error 03: interpolation of HK parameter ' + par_name.trim() + ' failed.'
 		journal
 		exit, status = 3
-	endif
+	endelse
 end