diff --git a/R/logLik.R b/R/logLik.R
index 5d21704c7..5c42f41a5 100644
--- a/R/logLik.R
+++ b/R/logLik.R
@@ -55,7 +55,7 @@ logLik.plm <- function(object, ...) {
 
   attr(val, "nall") <- N0
   attr(val, "nobs") <- N
-  attr(val, "df") <- insight::n_parameters(object) + 1
+  attr(val, "df") <- insight::n_parameters(object) + 1L
   class(val) <- "logLik"
 
   val