diff --git a/sdrbase/dsp/spectrumvis.h b/sdrbase/dsp/spectrumvis.h
index 2bf95da08..311411ef0 100644
--- a/sdrbase/dsp/spectrumvis.h
+++ b/sdrbase/dsp/spectrumvis.h
@@ -37,10 +37,10 @@
 class GLSpectrumInterface;
 class MessageQueue;
 
-class SDRGUI_API SpectrumVis : public BasebandSampleSink {
+class SDRBASE_API SpectrumVis : public BasebandSampleSink {
 
 public:
-    class MsgConfigureSpectrumVis : public Message {
+    class SDRBASE_API MsgConfigureSpectrumVis : public Message {
         MESSAGE_CLASS_DECLARATION
 
     public: