diff --git a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/PDAcroForm.java b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/PDAcroForm.java
index 1da2ef34436..51f7162b1e9 100644
--- a/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/PDAcroForm.java
+++ b/pdfbox/src/main/java/org/apache/pdfbox/pdmodel/interactive/form/PDAcroForm.java
@@ -784,7 +784,7 @@ private Map<COSDictionary,Set<COSDictionary>> buildPagesWidgetsMap(
                 }
                 else
                 {
-                    LOG.warn("missing /P entry (page reference) in a widget for field: " + field);
+                    LOG.warn("missing /P entry (page reference) in a widget for field: {}", field);
                     hasMissingPageRef = true;
                 }
             }