diff --git a/modules/juce_audio_processors/processors/juce_AudioProcessorParameterGroup.h b/modules/juce_audio_processors/processors/juce_AudioProcessorParameterGroup.h
index 2b67d1d66c4d..0a888bdcd21b 100644
--- a/modules/juce_audio_processors/processors/juce_AudioProcessorParameterGroup.h
+++ b/modules/juce_audio_processors/processors/juce_AudioProcessorParameterGroup.h
@@ -47,7 +47,7 @@ namespace juce
 
     @tags{Audio}
 */
-class AudioProcessorParameterGroup
+class JUCE_API AudioProcessorParameterGroup
 {
 public:
     //==============================================================================
diff --git a/modules/juce_core/xml/juce_XmlElement.h b/modules/juce_core/xml/juce_XmlElement.h
index d029592d239b..c320756f0ec6 100644
--- a/modules/juce_core/xml/juce_XmlElement.h
+++ b/modules/juce_core/xml/juce_XmlElement.h
@@ -144,7 +144,7 @@ class JUCE_API  XmlElement
     /** A struct containing options for formatting the text when representing an
         XML element as a string.
     */
-    struct TextFormat
+    struct JUCE_API TextFormat
     {
         /** Default constructor. */
         TextFormat();
diff --git a/modules/juce_dsp/processors/juce_Panner.h b/modules/juce_dsp/processors/juce_Panner.h
index 10343ae51649..10c2b64274c0 100644
--- a/modules/juce_dsp/processors/juce_Panner.h
+++ b/modules/juce_dsp/processors/juce_Panner.h
@@ -55,7 +55,7 @@ enum class PannerRule
     @tags{DSP}
 */
 template <typename SampleType>
-class Panner
+class JUCE_API Panner
 {
 public:
     //==============================================================================
diff --git a/modules/juce_gui_basics/windows/juce_ScopedMessageBox.h b/modules/juce_gui_basics/windows/juce_ScopedMessageBox.h
index 5a17ab213a95..dffccefb7c8d 100644
--- a/modules/juce_gui_basics/windows/juce_ScopedMessageBox.h
+++ b/modules/juce_gui_basics/windows/juce_ScopedMessageBox.h
@@ -42,7 +42,7 @@ namespace juce
 
     @tags{GUI}
 */
-class ScopedMessageBox
+class JUCE_API ScopedMessageBox
 {
 public:
     /** @internal */