diff --git a/DESCRIPTION b/DESCRIPTION
index 17d09fd88..637645eb9 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,6 +1,6 @@
 Package: marginaleffects
 Title: Predictions, Comparisons, Slopes, Marginal Means, and Hypothesis Tests
-Version: 0.23.0
+Version: 0.23.0.1
 Authors@R: 
     c(person(given = "Vincent",
              family = "Arel-Bundock",
@@ -157,6 +157,7 @@ Suggests:
     survey,
     survival,
     svglite,
+    systemfit,
     systemfonts,
     tibble,
     tictoc,
@@ -262,6 +263,7 @@ Collate:
     'methods_stats.R'
     'methods_survey.R'
     'methods_survival.R'
+    'methods_systemfit.R'
     'methods_tidymodels.R'
     'methods_tobit1.R'
     'modelarchive.R'
diff --git a/NAMESPACE b/NAMESPACE
index 65b52754f..34459db6d 100644
--- a/NAMESPACE
+++ b/NAMESPACE
@@ -28,6 +28,7 @@ S3method(get_coef,polr)
 S3method(get_coef,scam)
 S3method(get_coef,selection)
 S3method(get_coef,svyolr)
+S3method(get_coef,systemfit)
 S3method(get_coef,workflow)
 S3method(get_group_names,bracl)
 S3method(get_group_names,brmsfit)
@@ -109,6 +110,7 @@ S3method(get_vcov,orm)
 S3method(get_vcov,pstpm2)
 S3method(get_vcov,scam)
 S3method(get_vcov,stpm2)
+S3method(get_vcov,systemfit)
 S3method(get_vcov,workflow)
 S3method(glance,comparisons)
 S3method(glance,hypotheses)
diff --git a/NEWS.md b/NEWS.md
index dcc096708..d13deb546 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -1,5 +1,11 @@
 # News
 
+## Development
+
+Bugs:
+
+* `systemfit` models returned no standard errors when the same variables entered in different parts of the model. Thanks to @mronkko for report #1233.
+
 ## 0.23.0
 
 Breaking change:
diff --git a/R/methods_systemfit.R b/R/methods_systemfit.R
new file mode 100644
index 000000000..96c6c0bea
--- /dev/null
+++ b/R/methods_systemfit.R
@@ -0,0 +1,13 @@
+#' @rdname get_coef
+#' @export
+get_coef.systemfit <- function(model, ...) {
+    out <- stats::coef(model)
+    return(out)
+}
+
+#' @rdname get_vcov
+#' @export
+get_vcov.systemfit <- function(model, ...) {
+    out <- stats::vcov(model)
+    return(out)
+}
diff --git a/inst/tinytest/test-pkg-survfit.R b/inst/tinytest/test-pkg-survfit.R
new file mode 100644
index 000000000..2dc952738
--- /dev/null
+++ b/inst/tinytest/test-pkg-survfit.R
@@ -0,0 +1,22 @@
+source("helpers.R")
+using("marginaleffects")
+requiet("systemfit")
+requiet("MASS")
+
+# issue #1233: duplicated coefficient names
+set.seed(12345)
+N <- 100
+C <- matrix(c(1, .3, .3,
+              .3,  1, .3,
+              .3, .3,  1), 3, 3)
+colnames(C) <- rownames(C) <- c("x1", "x2", "x3")
+data <- as.data.frame(mvrnorm(N, rep(0, 3), C))
+sys <- with(data, {
+    y1 <- 2 * x1 + 3 * x2 + x3 + 10 * rnorm(N)
+    m1 <- lm(y1 ~ x1 + x2 + x3)
+    y2 <- x1 + 3 * x2 + 2 * x3 + 10 * rnorm(N)
+    m2 <- lm(y2 ~ x1 + x2 + x3)
+    systemfit(list(formula(m1), formula(m2)), data = data)
+})
+h <- hypotheses(sys)
+expect_false(anyNA(h$std.error))
diff --git a/man/get_coef.Rd b/man/get_coef.Rd
index 3ac9bda4f..e9b728af3 100644
--- a/man/get_coef.Rd
+++ b/man/get_coef.Rd
@@ -6,7 +6,7 @@
 %   R/methods_glmtoolbox.R, R/methods_lme4.R, R/methods_mclogit.R,
 %   R/methods_mgcv.R, R/methods_mlm.R, R/methods_sampleSelection.R,
 %   R/methods_scam.R, R/methods_stats.R, R/methods_survey.R,
-%   R/methods_tidymodels.R
+%   R/methods_systemfit.R, R/methods_tidymodels.R
 \name{get_coef}
 \alias{get_coef}
 \alias{get_coef.default}
@@ -32,6 +32,7 @@
 \alias{get_coef.scam}
 \alias{get_coef.nls}
 \alias{get_coef.svyolr}
+\alias{get_coef.systemfit}
 \alias{get_coef.workflow}
 \title{Get a named vector of coefficients from a model object (internal function)}
 \usage{
@@ -83,6 +84,8 @@ get_coef(model, ...)
 
 \method{get_coef}{svyolr}(model, ...)
 
+\method{get_coef}{systemfit}(model, ...)
+
 \method{get_coef}{workflow}(model, ...)
 }
 \arguments{
diff --git a/man/get_vcov.Rd b/man/get_vcov.Rd
index e944e9360..d50762d16 100644
--- a/man/get_vcov.Rd
+++ b/man/get_vcov.Rd
@@ -3,7 +3,7 @@
 %   R/methods_afex.R, R/methods_aod.R, R/methods_biglm.R, R/methods_brms.R,
 %   R/methods_dbarts.R, R/methods_gamlss.R, R/methods_glmmTMB.R,
 %   R/methods_mhurdle.R, R/methods_mlr3.R, R/methods_rms.R, R/methods_rstpm2.R,
-%   R/methods_scam.R, R/methods_tidymodels.R
+%   R/methods_scam.R, R/methods_systemfit.R, R/methods_tidymodels.R
 \name{get_vcov}
 \alias{get_vcov}
 \alias{get_vcov.default}
@@ -23,6 +23,7 @@
 \alias{get_vcov.gsm}
 \alias{get_vcov.aft}
 \alias{get_vcov.scam}
+\alias{get_vcov.systemfit}
 \alias{get_vcov.model_fit}
 \alias{get_vcov.workflow}
 \title{Get a named variance-covariance matrix from a model object (internal function)}
@@ -63,6 +64,8 @@ get_vcov(model, ...)
 
 \method{get_vcov}{scam}(model, vcov = NULL, ...)
 
+\method{get_vcov}{systemfit}(model, ...)
+
 \method{get_vcov}{model_fit}(model, type = NULL, ...)
 
 \method{get_vcov}{workflow}(model, type = NULL, ...)