diff --git a/src/protocols/rdp/channels/common-svc.h b/src/protocols/rdp/channels/common-svc.h
index aaa7aab4..0a420bc7 100644
--- a/src/protocols/rdp/channels/common-svc.h
+++ b/src/protocols/rdp/channels/common-svc.h
@@ -28,8 +28,6 @@
 #include <winpr/wtsapi.h>
 #include <winpr/wtypes.h>
 
-struct guac_rdp_common_svc;
-
 /**
  * The maximum number of bytes to allow within each channel name, including
  * null terminator.
diff --git a/src/protocols/rdp/channels/rdpdr/rdpdr.h b/src/protocols/rdp/channels/rdpdr/rdpdr.h
index b074348a..105b50aa 100644
--- a/src/protocols/rdp/channels/rdpdr/rdpdr.h
+++ b/src/protocols/rdp/channels/rdpdr/rdpdr.h
@@ -28,8 +28,6 @@
 
 #include <stdint.h>
 
-struct guac_rdpdr_device;
-
 /**
  * The maximum number of bytes to allow for a device read.
  */
diff --git a/src/protocols/rdp/keymap.h b/src/protocols/rdp/keymap.h
index 6ec627f5..bac1a7fa 100644
--- a/src/protocols/rdp/keymap.h
+++ b/src/protocols/rdp/keymap.h
@@ -22,8 +22,6 @@
 
 #include <winpr/wtypes.h>
 
-struct guac_rdp_keymap;
-
 /**
  * Represents a keysym-to-scancode mapping for RDP, with extra information
  * about the state of prerequisite keysyms.