diff --git a/CMakeLists.txt b/CMakeLists.txt
index ac957230b7..27023d35af 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -235,7 +235,8 @@ set(GZ_SIM_GUI_PLUGIN_INSTALL_DIR
 #============================================================================
 # Configure the build
 #============================================================================
-gz_configure_build(QUIT_IF_BUILD_ERRORS)
+gz_configure_build(QUIT_IF_BUILD_ERRORS
+  HIDE_SYMBOLS_BY_DEFAULT)
 
 add_subdirectory(examples)
 
diff --git a/src/gui/plugins/joint_position_controller/JointPositionController.hh b/src/gui/plugins/joint_position_controller/JointPositionController.hh
index 0e23ca4bc9..172f893f65 100644
--- a/src/gui/plugins/joint_position_controller/JointPositionController.hh
+++ b/src/gui/plugins/joint_position_controller/JointPositionController.hh
@@ -25,6 +25,17 @@
 #include <gz/sim/gui/GuiSystem.hh>
 #include <gz/sim/Types.hh>
 
+#ifndef _WIN32
+#  define JointPositionController_EXPORTS_API \
+      __attribute__ ((visibility ("default")))
+#else
+#  if (defined(JointPositionController_EXPORTS))
+#    define JointPositionController_EXPORTS_API __declspec(dllexport)
+#  else
+#    define JointPositionController_EXPORTS_API __declspec(dllimport)
+#  endif
+#endif
+
 Q_DECLARE_METATYPE(gz::sim::Entity)
 
 namespace gz
@@ -36,7 +47,8 @@ namespace gui
   class JointPositionControllerPrivate;
 
   /// \brief Model holding information about joints
-  class JointsModel : public QStandardItemModel
+  class JointPositionController_EXPORTS_API JointsModel :
+    public QStandardItemModel
   {
     Q_OBJECT
 
@@ -88,7 +100,8 @@ namespace gui
   /// `<model_name>`: Load the widget pointed at the given model, so it's not
   /// necessary to select it. If a model is given at startup, the plugin starts
   /// in locked mode.
-  class JointPositionController : public sim::GuiSystem
+  class JointPositionController_EXPORTS_API JointPositionController :
+    public sim::GuiSystem
   {
     Q_OBJECT
 
diff --git a/src/gui/plugins/plot_3d/Plot3D.hh b/src/gui/plugins/plot_3d/Plot3D.hh
index d3d7836e5a..180f68a785 100644
--- a/src/gui/plugins/plot_3d/Plot3D.hh
+++ b/src/gui/plugins/plot_3d/Plot3D.hh
@@ -24,6 +24,16 @@
 
 #include "gz/gui/qt.h"
 
+#ifndef _WIN32
+#  define Plot3D_EXPORTS_API __attribute__ ((visibility ("default")))
+#else
+#  if (defined(Plot3D_EXPORTS))
+#    define Plot3D_EXPORTS_API __declspec(dllexport)
+#  else
+#    define Plot3D_EXPORTS_API __declspec(dllimport)
+#  endif
+#endif
+
 namespace gz
 {
 namespace sim
@@ -59,7 +69,7 @@ namespace gui
   /// After this number is reached, the older points start being deleted.
   /// Defaults to 1000.
   ///
-  class Plot3D : public gz::sim::GuiSystem
+  class Plot3D_EXPORTS_API Plot3D : public gz::sim::GuiSystem
   {
     Q_OBJECT