diff --git a/Sources/Plasma/PubUtilLib/plSDL/plSDL.h b/Sources/Plasma/PubUtilLib/plSDL/plSDL.h
index fbbd91d1..d93bc17f 100644
--- a/Sources/Plasma/PubUtilLib/plSDL/plSDL.h
+++ b/Sources/Plasma/PubUtilLib/plSDL/plSDL.h
@@ -516,8 +516,8 @@ private:
         plVarDescriptor*& curVar) const;
     bool IParseStateDesc(const char* fileName, hsStream* stream, char token[], plStateDescriptor*& curDesc) const;
 
-    void DebugMsg(char* fmt, ...) const;
-    void DebugMsgV(char* fmt, va_list args) const;
+    void DebugMsg(const char* fmt, ...) const;
+    void DebugMsgV(const char* fmt, va_list args) const;
 
 public:
 
diff --git a/Sources/Plasma/PubUtilLib/plSDL/plSDLParser.cpp b/Sources/Plasma/PubUtilLib/plSDL/plSDLParser.cpp
index 8ba5c766..41ff6361 100644
--- a/Sources/Plasma/PubUtilLib/plSDL/plSDLParser.cpp
+++ b/Sources/Plasma/PubUtilLib/plSDL/plSDLParser.cpp
@@ -49,7 +49,7 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 
 static const int kTokenLen=256;
 
-void plSDLParser::DebugMsg(char* fmt, ...) const
+void plSDLParser::DebugMsg(const char* fmt, ...) const
 {
     return;
     plNetApp* netApp = plSDLMgr::GetInstance()->GetNetApp();
@@ -66,7 +66,7 @@ void plSDLParser::DebugMsg(char* fmt, ...) const
     va_end(args);
 }
 
-void plSDLParser::DebugMsgV(char* fmt, va_list args) const
+void plSDLParser::DebugMsgV(const char* fmt, va_list args) const
 {
     if (strlen(fmt)==nil)
         return;