diff --git a/R/parse_citation.R b/R/parse_citation.R
index 4142f450..97527479 100644
--- a/R/parse_citation.R
+++ b/R/parse_citation.R
@@ -62,9 +62,6 @@ parse_citation <- function(bib){
   out
 }
 
-drop_null <- function(x){
-  x[lapply(x,length)!=0]
-}
 
 ## guessCitation referencePublication or citation?
 
diff --git a/R/utils.R b/R/utils.R
index e53a94c6..299eb97c 100644
--- a/R/utils.R
+++ b/R/utils.R
@@ -1,3 +1,7 @@
+drop_null <- function(x){
+  x[lapply(x,length)!=0]
+}
+
 
 #' @importFrom utils installed.packages
 get_root_path <- function(pkg){