diff --git a/NAMESPACE b/NAMESPACE
index 68a136ba..3c3fb388 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -1,5 +1,7 @@
 # Generated by roxygen2: do not edit by hand
 
+S3method(as_gt,fixed_design)
+S3method(as_gt,gs_design)
 S3method(as_gt,simtrial_gs_wlr)
 S3method(summary,simtrial_gs_wlr)
 S3method(wlr,counting_process)
diff --git a/R/as_gt.R b/R/as_gt.R
index 0f9111d5..f43e857c 100644
--- a/R/as_gt.R
+++ b/R/as_gt.R
@@ -142,3 +142,16 @@ as_gt.simtrial_gs_wlr <- function(x,
       gt::tab_header(title = title, subtitle = subtitle)
   }
 }
+
+# Only purpose of the methods below is to fix S3 redirection when simtrial is
+# loaded after gsDesign2, which masks the as_gt() generic from gsDesign2
+
+#' @export
+as_gt.fixed_design <- function(x, ...) {
+  gsDesign2:::as_gt.fixed_design(x, ...)
+}
+
+#' @export
+as_gt.gs_design <- function(x, ...) {
+  gsDesign2:::as_gt.gs_design(x, ...)
+}