diff --git a/R/performance_pcp.R b/R/performance_pcp.R
index 653c4afa5..edcf4c724 100644
--- a/R/performance_pcp.R
+++ b/R/performance_pcp.R
@@ -112,13 +112,13 @@ print.performance_pcp <- function(x, digits = 2, ...) {
 #' @export
 as.data.frame.performance_pcp <- function(x, row.names = NULL, ...) {
   data.frame(
-    "Model" = c("full", "null"),
-    "Estimate" = c(x$pcp_model, x$pcp_m0),
-    "CI_low" = c(x$model_ci_low, x$null_ci_low),
-    "CI_high" = c(x$model_ci_high, x$null_ci_high),
-    "Chisq" = c(NA, x$lrt_chisq),
-    "df_error" = c(NA, x$lrt_df_error),
-    "p" = c(NA, x$lrt_p),
+    Model = c("full", "null"),
+    Estimate = c(x$pcp_model, x$pcp_m0),
+    CI_low = c(x$model_ci_low, x$null_ci_low),
+    CI_high = c(x$model_ci_high, x$null_ci_high),
+    Chisq = c(NA, x$lrt_chisq),
+    df_error = c(NA, x$lrt_df_error),
+    p = c(NA, x$lrt_p),
     stringsAsFactors = FALSE,
     row.names = row.names,
     ...