diff --git a/core/sourcemod.cpp b/core/sourcemod.cpp
index 51ba5a5a..e77c8f5f 100644
--- a/core/sourcemod.cpp
+++ b/core/sourcemod.cpp
@@ -479,7 +479,7 @@ void SourceModBase::DoGlobalPluginLoads()
 	g_PluginSys.AllPluginsLoaded();
 }
 
-size_t SourceModBase::BuildPath(PathType type, char *buffer, size_t maxlength, char *format, ...)
+size_t SourceModBase::BuildPath(PathType type, char *buffer, size_t maxlength, const char *format, ...)
 {
 	char _buffer[PLATFORM_MAX_PATH];
 	va_list ap;
diff --git a/core/sourcemod.h b/core/sourcemod.h
index 53a4e01b..e677dae2 100644
--- a/core/sourcemod.h
+++ b/core/sourcemod.h
@@ -103,7 +103,7 @@ public: // SMGlobalClass
 public: // ISourceMod
 	const char *GetGamePath() const;
 	const char *GetSourceModPath() const;
-	size_t BuildPath(PathType type, char *buffer, size_t maxlength, char *format, ...);
+	size_t BuildPath(PathType type, char *buffer, size_t maxlength, const char *format, ...);
 	void LogMessage(IExtension *pExt, const char *format, ...);
 	void LogError(IExtension *pExt, const char *format, ...);
 	size_t FormatString(char *buffer, size_t maxlength, IPluginContext *pContext, const cell_t *params, unsigned int param);
diff --git a/public/ISourceMod.h b/public/ISourceMod.h
index 38cabf0c..bf1d4666 100644
--- a/public/ISourceMod.h
+++ b/public/ISourceMod.h
@@ -101,7 +101,7 @@ namespace SourceMod
 		 * @param ...		Format arguments.
 		 * @return			Number of bytes written.
 		 */
-		virtual size_t BuildPath(PathType type, char *buffer, size_t maxlength, char *format, ...) =0;
+		virtual size_t BuildPath(PathType type, char *buffer, size_t maxlength, const char *format, ...) =0;
 
 		/**
 		 * @brief Logs a message to the SourceMod logs.