diff --git a/motorApp/ImsSrc/ImsMDrivePlusMotorAxis.h b/motorApp/ImsSrc/ImsMDrivePlusMotorAxis.h
index f992a3f4..1db01430 100644
--- a/motorApp/ImsSrc/ImsMDrivePlusMotorAxis.h
+++ b/motorApp/ImsSrc/ImsMDrivePlusMotorAxis.h
@@ -20,7 +20,7 @@
 #define MAX_NAME_LEN 10
 #define LOCAL_LINE_LEN 256
 
-class ImsMDrivePlusMotorController;
+class epicsShareClass ImsMDrivePlusMotorController;
 
 ////////////////////////////////////
 // ImsMDrivePlusMotorAxis class
diff --git a/motorApp/ImsSrc/ImsMDrivePlusMotorController.h b/motorApp/ImsSrc/ImsMDrivePlusMotorController.h
index f7e10b08..caf5b038 100644
--- a/motorApp/ImsSrc/ImsMDrivePlusMotorController.h
+++ b/motorApp/ImsSrc/ImsMDrivePlusMotorController.h
@@ -13,7 +13,7 @@
 //  ImsMDrivePlusMotorController class
 //! derived from asynMotorController class
 ////////////////////////////////////
-class ImsMDrivePlusMotorController : public asynMotorController
+class epicsShareClass ImsMDrivePlusMotorController : public asynMotorController
 {
 public:
 	/////////////////////////////////////////