diff --git a/libs/pbd/pbd/libpbd_visibility.h b/libs/pbd/pbd/libpbd_visibility.h
index 9a5fc7f585..529e63bbfc 100644
--- a/libs/pbd/pbd/libpbd_visibility.h
+++ b/libs/pbd/pbd/libpbd_visibility.h
@@ -36,7 +36,7 @@
   #define LIBPBD_TEMPLATE_MEMBER_DLL_EXPORT
 #endif
 
-#ifdef LIBPBD_STATIC // libpbd is a DLL
+#ifdef LIBPBD_STATIC // libpbd is not a DLL
   #define LIBPBD_API
   #define LIBPBD_LOCAL
   #define LIBPBD_TEMPLATE_API
diff --git a/libs/zita-convolver/zita-convolver/zconvolver_visibility.h b/libs/zita-convolver/zita-convolver/zconvolver_visibility.h
index 8e98fc73d7..74a7d4a33c 100644
--- a/libs/zita-convolver/zita-convolver/zconvolver_visibility.h
+++ b/libs/zita-convolver/zita-convolver/zconvolver_visibility.h
@@ -11,7 +11,7 @@
   #define LIBZCONVOLVER_DLL_LOCAL  __attribute__ ((visibility ("hidden")))
 #endif
 
-#ifdef LIBZCONVOLVER_STATIC // libzita-convolver is a DLL
+#ifdef LIBZCONVOLVER_STATIC // libzita-convolver is not a DLL
   #define LIBZCONVOLVER_API
   #define LIBZCONVOLVER_LOCAL
   #define LIBZCONVOLVER_TEMPLATE_API
diff --git a/libs/zita-resampler/zita-resampler/zresampler_visibility.h b/libs/zita-resampler/zita-resampler/zresampler_visibility.h
index ee118261dd..09d980e1a1 100644
--- a/libs/zita-resampler/zita-resampler/zresampler_visibility.h
+++ b/libs/zita-resampler/zita-resampler/zresampler_visibility.h
@@ -11,7 +11,7 @@
   #define LIBZRESAMPLER_DLL_LOCAL  __attribute__ ((visibility ("hidden")))
 #endif
 
-#ifdef LIBZRESAMPLER_STATIC // libzita-resampler is a DLL
+#ifdef LIBZRESAMPLER_STATIC // libzita-resampler is not a DLL
   #define LIBZRESAMPLER_API
   #define LIBZRESAMPLER_LOCAL
   #define LIBZRESAMPLER_TEMPLATE_API