diff --git a/src/gui/WndMain.cpp b/src/gui/WndMain.cpp
index eeb23038f..76cfe91bf 100644
--- a/src/gui/WndMain.cpp
+++ b/src/gui/WndMain.cpp
@@ -2287,7 +2287,7 @@ void WndMain::StopEmulation()
 }
 
 // wrapper function to call CrashMonitor
-DWORD WINAPI WndMain::CrashMonitorWrapper(LPVOID lpParam)
+DWORD WndMain::CrashMonitorWrapper(LPVOID lpParam)
 {
 	CxbxSetThreadName("Cxbx Crash Monitor");
 
@@ -2347,7 +2347,7 @@ void WndMain::CrashMonitor(DWORD dwChildProcID)
 }
 
 // monitor for Debugger to close then set as "available" (For limit to 1 debugger per Cxbx GUI.)
-DWORD WINAPI WndMain::DebuggerMonitor(LPVOID lpVoid)
+DWORD WndMain::DebuggerMonitor(LPVOID lpVoid)
 {
 	CxbxSetThreadName("Cxbx Debugger Monitor");
 	WndMain* pThis = static_cast<WndMain*>(lpVoid);
diff --git a/src/gui/WndMain.h b/src/gui/WndMain.h
index fe176a8cb..6fa7a5a0c 100644
--- a/src/gui/WndMain.h
+++ b/src/gui/WndMain.h
@@ -131,7 +131,7 @@ class WndMain : public Wnd
 		// ******************************************************************
 		// * crash monitoring wrapper function
 		// ******************************************************************
-		static DWORD WINAPI CrashMonitorWrapper(LPVOID lpParam);
+		static DWORD CrashMonitorWrapper(LPVOID lpParam);
 
 		// ******************************************************************
 		// * crash monitoring function thread
@@ -141,7 +141,7 @@ class WndMain : public Wnd
 		// ******************************************************************
 		// * Debugger monitoring function thread
 		// ******************************************************************
-		static DWORD WINAPI DebuggerMonitor(LPVOID lpVoid);
+		static DWORD DebuggerMonitor(LPVOID lpVoid);
 
 		// ******************************************************************
 		// * Close debugger monitoring function