diff --git a/src/fix_enforce2d.cpp b/src/fix_enforce2d.cpp
index fff0f53535..31a3e0d31a 100644
--- a/src/fix_enforce2d.cpp
+++ b/src/fix_enforce2d.cpp
@@ -15,6 +15,7 @@
 #include "fix_enforce2d.h"
 #include "atom.h"
 #include "update.h"
+#include "domain.h"
 #include "respa.h"
 #include "error.h"
 
@@ -41,6 +42,14 @@ int FixEnforce2D::setmask()
 
 /* ---------------------------------------------------------------------- */
 
+void FixEnforce2D::init()
+{
+  if (domain->dimension == 3)
+    error->all("Should not use fix enforce2d with 3d simulation");
+}
+
+/* ---------------------------------------------------------------------- */
+
 void FixEnforce2D::setup(int vflag)
 {
   if (strcmp(update->integrate_style,"verlet") == 0)
diff --git a/src/fix_enforce2d.h b/src/fix_enforce2d.h
index b1b9440e72..f8f2a415c8 100644
--- a/src/fix_enforce2d.h
+++ b/src/fix_enforce2d.h
@@ -22,6 +22,7 @@ class FixEnforce2D : public Fix {
  public:
   FixEnforce2D(class LAMMPS *, int, char **);
   int setmask();
+  void init();
   void setup(int);
   void min_setup(int);
   void post_force(int);