diff --git a/src/class/ompi_object.h b/src/class/ompi_object.h
index 0bbe6c39f2..45ceff8164 100644
--- a/src/class/ompi_object.h
+++ b/src/class/ompi_object.h
@@ -348,7 +348,7 @@ OMPI_DECLSPEC void ompi_class_initialize(ompi_class_t *);
  * tools like valgrind and purify don't report still-reachable memory
  * upon process termination.
  */
-int ompi_class_finalize(void);
+OMPI_DECLSPEC int ompi_class_finalize(void);
 
 END_C_DECLS
 /**
diff --git a/src/mca/gpr/base/base.h b/src/mca/gpr/base/base.h
index 34047e3eb4..12ba1edfc8 100644
--- a/src/mca/gpr/base/base.h
+++ b/src/mca/gpr/base/base.h
@@ -220,10 +220,10 @@ OMPI_DECLSPEC int orte_gpr_base_xfer_payload(orte_gpr_value_union_t *dest,
 /*
  * globals that might be needed inside the gpr
  */
-extern int orte_gpr_base_output;
-extern bool orte_gpr_base_selected;
-extern ompi_list_t orte_gpr_base_components_available;
-extern mca_gpr_base_component_t orte_gpr_base_selected_component;
+OMPI_DECLSPEC extern int orte_gpr_base_output;
+OMPI_DECLSPEC extern bool orte_gpr_base_selected;
+OMPI_DECLSPEC extern ompi_list_t orte_gpr_base_components_available;
+OMPI_DECLSPEC extern mca_gpr_base_component_t orte_gpr_base_selected_component;
 
 #if defined(c_plusplus) || defined(__cplusplus)
 }
diff --git a/src/mca/iof/base/base.h b/src/mca/iof/base/base.h
index fdcfe555cb..6a261d50df 100644
--- a/src/mca/iof/base/base.h
+++ b/src/mca/iof/base/base.h
@@ -59,13 +59,13 @@ typedef struct orte_iof_base_t orte_iof_base_t;
 
 
 
-int orte_iof_base_open(void);
-int orte_iof_base_close(void);
-int orte_iof_base_select(void);
-int orte_iof_base_flush(void);
+OMPI_DECLSPEC int orte_iof_base_open(void);
+OMPI_DECLSPEC int orte_iof_base_close(void);
+OMPI_DECLSPEC int orte_iof_base_select(void);
+OMPI_DECLSPEC int orte_iof_base_flush(void);
 
 
-extern orte_iof_base_t orte_iof_base;
+OMPI_DECLSPEC extern orte_iof_base_t orte_iof_base;
 
 #if defined(c_plusplus) || defined(__cplusplus)
 }