diff --git a/src/H5api_adpt.h b/src/H5api_adpt.h
index d7f2bdf46e..6297f47325 100644
--- a/src/H5api_adpt.h
+++ b/src/H5api_adpt.h
@@ -59,6 +59,8 @@
 #define H5_DLL
 #define H5_DLLVAR extern
 #define H5_DLLCPP
+#define H5TEST_DLL
+#define H5TEST_DLLVAR extern
 #endif
 
 #endif /* H5API_ADPT_H */