diff --git a/src/oplsynth/music_opl_mididevice.cpp b/src/oplsynth/music_opl_mididevice.cpp
index 3939aa814..3cd3e625a 100644
--- a/src/oplsynth/music_opl_mididevice.cpp
+++ b/src/oplsynth/music_opl_mididevice.cpp
@@ -41,13 +41,14 @@
 #include "m_swap.h"
 #include "w_wad.h"
 #include "v_text.h"
+#include "i_system.h"
 #include "opl.h"
 
 // MACROS ------------------------------------------------------------------
 
 #if defined(_DEBUG) && defined(_WIN32) && defined(_MSC_VER)
 #define DEBUGOUT(m,c,s,t) \
-	{ char foo[128]; mysnprintf(foo, countof(foo), m, c, s, t); OutputDebugString(foo); }
+	{ char foo[128]; mysnprintf(foo, countof(foo), m, c, s, t); I_DebugPrint(foo); }
 #else
 #define DEBUGOUT(m,c,s,t)
 #endif
diff --git a/src/posix/cocoa/i_system.mm b/src/posix/cocoa/i_system.mm
index 07e85281b..6224228ad 100644
--- a/src/posix/cocoa/i_system.mm
+++ b/src/posix/cocoa/i_system.mm
@@ -183,6 +183,12 @@ void I_SetIWADInfo()
 }
 
 
+void I_DebugPrint(const char *cp)
+{
+	NSLog(@"%s", cp);
+}
+
+
 void I_PrintStr(const char* const message)
 {
 	FConsoleWindow::GetInstance().AddText(message);
diff --git a/src/posix/i_system.h b/src/posix/i_system.h
index 0515f2d85..5051b19c1 100644
--- a/src/posix/i_system.h
+++ b/src/posix/i_system.h
@@ -111,6 +111,8 @@ void addterm (void (*func)(void), const char *name);
 #define atterm(t) addterm (t, #t)
 void popterm ();
 
+void I_DebugPrint (const char *cp);
+
 // Print a console string
 void I_PrintStr (const char *str);
 
diff --git a/src/posix/sdl/i_system.cpp b/src/posix/sdl/i_system.cpp
index 84b953717..5cf5bf280 100644
--- a/src/posix/sdl/i_system.cpp
+++ b/src/posix/sdl/i_system.cpp
@@ -232,6 +232,10 @@ void I_SetIWADInfo ()
 {
 }
 
+void I_DebugPrint(const char *cp)
+{
+}
+
 void I_PrintStr (const char *cp)
 {
 	// Strip out any color escape sequences before writing to the log file
diff --git a/src/sound/music_softsynth_mididevice.cpp b/src/sound/music_softsynth_mididevice.cpp
index 9897da95c..6bde3edf6 100644
--- a/src/sound/music_softsynth_mididevice.cpp
+++ b/src/sound/music_softsynth_mididevice.cpp
@@ -40,6 +40,7 @@
 #include "m_swap.h"
 #include "w_wad.h"
 #include "v_text.h"
+#include "i_system.h"
 
 // MACROS ------------------------------------------------------------------
 
@@ -337,7 +338,7 @@ int SoftSynthMIDIDevice::PlayTick()
 				char buffer[128];
 				mysnprintf(buffer, countof(buffer), "C%02d: %11s %3d %3d\n", (status & 15) + 1, commands[(status >> 4) & 7], parm1, parm2);
 #ifdef _WIN32
-				OutputDebugString(buffer);
+				I_DebugPrint(buffer);
 #else
 				fputs(buffer, stderr);
 #endif
diff --git a/src/timidity/timidity.cpp b/src/timidity/timidity.cpp
index efebcd284..4ca2b872e 100644
--- a/src/timidity/timidity.cpp
+++ b/src/timidity/timidity.cpp
@@ -782,11 +782,6 @@ void Renderer::MarkInstrument(int banknum, int percussion, int instr)
 	}
 }
 
-#ifdef _WIN32
-#define WIN32_LEAN_AND_MEAN
-#include <windows.h>
-#endif
-
 void cmsg(int type, int verbosity_level, const char *fmt, ...)
 {
 	/*
@@ -801,7 +796,7 @@ void cmsg(int type, int verbosity_level, const char *fmt, ...)
 	va_start(args, fmt);
 	vsprintf(buf, fmt, args);
 	va_end(args);
-	OutputDebugString(buf);
+	I_DebugPrint(buf);
 #endif
 }
 
diff --git a/src/win32/i_system.cpp b/src/win32/i_system.cpp
index ebf90e476..98eaf669c 100644
--- a/src/win32/i_system.cpp
+++ b/src/win32/i_system.cpp
@@ -1051,6 +1051,11 @@ static void DoPrintStr(const char *cp, HWND edit, HANDLE StdOut)
 
 static TArray<FString> bufferedConsoleStuff;
 
+void I_DebugPrint(const char *cp)
+{
+	OutputDebugStringA(cp);
+}
+
 void I_PrintStr(const char *cp)
 {
 	if (con_debugoutput)
diff --git a/src/win32/i_system.h b/src/win32/i_system.h
index 8e75b22a3..6bee888f2 100644
--- a/src/win32/i_system.h
+++ b/src/win32/i_system.h
@@ -145,6 +145,8 @@ bool I_SetCursor(FTexture *cursor);
 // Repaint the pre-game console
 void I_PaintConsole (void);
 
+void I_DebugPrint (const char *cp);
+
 // Print a console string
 void I_PrintStr (const char *cp);