diff --git a/src/d_think.h b/src/d_think.h
index 29b67718e..f3dda9380 100644
--- a/src/d_think.h
+++ b/src/d_think.h
@@ -23,10 +23,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 //
 // Experimental stuff.
 // To compile this as "ANSI C with classes" we will need to handle the various
diff --git a/src/d_ticcmd.h b/src/d_ticcmd.h
index d388a6d00..69882e89b 100644
--- a/src/d_ticcmd.h
+++ b/src/d_ticcmd.h
@@ -21,10 +21,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 #define MAXPREDICTTICS 30
 
 // Button/action code definitions.
diff --git a/src/i_addrinfo.h b/src/i_addrinfo.h
index 8a1ba8f4b..948da7967 100644
--- a/src/i_addrinfo.h
+++ b/src/i_addrinfo.h
@@ -16,10 +16,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 #ifndef AI_PASSIVE
 #define AI_PASSIVE     0x01
 #endif
diff --git a/src/i_net.h b/src/i_net.h
index bcd07eb17..e13c3d9a9 100644
--- a/src/i_net.h
+++ b/src/i_net.h
@@ -14,10 +14,6 @@
 #ifndef __I_NET__
 #define __I_NET__
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 #include "doomdef.h"
 #include "command.h"
 
diff --git a/src/i_system.h b/src/i_system.h
index b760fd677..028132178 100644
--- a/src/i_system.h
+++ b/src/i_system.h
@@ -21,10 +21,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 /**	\brief max quit functions
 */
 #define MAX_QUIT_FUNCS     16
diff --git a/src/i_video.h b/src/i_video.h
index 1c9a9a64c..72c68e27e 100644
--- a/src/i_video.h
+++ b/src/i_video.h
@@ -20,10 +20,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 typedef enum
 {
 	/// Software
diff --git a/src/p_pspr.h b/src/p_pspr.h
index 9bb8366bb..23d507550 100644
--- a/src/p_pspr.h
+++ b/src/p_pspr.h
@@ -35,10 +35,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 /// \brief Frame flags: only the frame number - 0 to 256 (Frames from 0 to 63, Sprite2 number uses 0 to 127 plus FF_SPR2SUPER)
 #define FF_FRAMEMASK 0xff
 
diff --git a/src/p_saveg.h b/src/p_saveg.h
index a0b0f8587..0da3b065d 100644
--- a/src/p_saveg.h
+++ b/src/p_saveg.h
@@ -18,10 +18,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 // 1024 bytes is plenty for a savegame
 #define SAVEGAMESIZE (1024)
 
diff --git a/src/p_tick.h b/src/p_tick.h
index 06ff08820..8f867f2b9 100644
--- a/src/p_tick.h
+++ b/src/p_tick.h
@@ -20,10 +20,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 extern tic_t leveltime;
 
 // Called by G_Ticker. Carries out all thinking of enemies and players.
diff --git a/src/r_bsp.h b/src/r_bsp.h
index 74ca05f52..17407f5e6 100644
--- a/src/r_bsp.h
+++ b/src/r_bsp.h
@@ -20,10 +20,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 extern seg_t *curline;
 extern side_t *sidedef;
 extern line_t *linedef;
diff --git a/src/r_data.h b/src/r_data.h
index 15ef8982a..b006ac862 100644
--- a/src/r_data.h
+++ b/src/r_data.h
@@ -22,10 +22,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 // Store lists of lumps for F_START/F_END etc.
 struct lumplist_t
 {
diff --git a/src/r_segs.h b/src/r_segs.h
index b9052cfa4..c5eee53c3 100644
--- a/src/r_segs.h
+++ b/src/r_segs.h
@@ -18,10 +18,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 transnum_t R_GetLinedefTransTable(fixed_t alpha);
 void R_RenderMaskedSegRange(drawseg_t *ds, INT32 x1, INT32 x2);
 void R_RenderThickSideRange(drawseg_t *ds, INT32 x1, INT32 x2, ffloor_t *pffloor);
diff --git a/src/r_sky.h b/src/r_sky.h
index abf29b508..5a4f5e9ee 100644
--- a/src/r_sky.h
+++ b/src/r_sky.h
@@ -20,10 +20,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 /// \brief SKY, store the number for name.
 #define SKYFLATNAME "F_SKY1"
 
diff --git a/src/r_state.h b/src/r_state.h
index 43e5bdcbb..2436ddd0f 100644
--- a/src/r_state.h
+++ b/src/r_state.h
@@ -23,10 +23,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 //
 // Refresh internal data structures, for rendering.
 //
diff --git a/src/r_textures.h b/src/r_textures.h
index 979b4dbae..2559766f6 100644
--- a/src/r_textures.h
+++ b/src/r_textures.h
@@ -23,10 +23,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 #define MISSING_TEXTURE "MISSTEX" // Replacement for invalid textures
 						 
 // A single patch from a texture definition,
diff --git a/src/w_wad.h b/src/w_wad.h
index 79aee8cc1..43aa1b228 100644
--- a/src/w_wad.h
+++ b/src/w_wad.h
@@ -22,10 +22,6 @@
 extern "C" {
 #endif
 
-#ifdef __GNUG__
-#pragma interface
-#endif
-
 // a raw entry of the wad directory
 // NOTE: This sits here and not in w_wad.c because p_setup.c makes use of it to load map WADs inside PK3s.
 #if defined(_MSC_VER)