diff --git a/src/inet/protocolelement/shaper/GroupEligibilityTimeMeter.h b/src/inet/protocolelement/shaper/GroupEligibilityTimeMeter.h
index 0eb891500b1..7d42d078f61 100644
--- a/src/inet/protocolelement/shaper/GroupEligibilityTimeMeter.h
+++ b/src/inet/protocolelement/shaper/GroupEligibilityTimeMeter.h
@@ -13,7 +13,7 @@
 
 namespace inet {
 
-class GroupEligibilityTimeMeter : public EligibilityTimeMeter
+class INET_API GroupEligibilityTimeMeter : public EligibilityTimeMeter
 {
     protected:
         ModuleRefByPar<GroupEligibilityTimeTable> groupEligibilityTimeTable;