diff --git a/Source/MIPSAssembler.cpp b/Source/MIPSAssembler.cpp
index 425420c5f..d53d5beff 100644
--- a/Source/MIPSAssembler.cpp
+++ b/Source/MIPSAssembler.cpp
@@ -15,7 +15,7 @@ CMIPSAssembler::~CMIPSAssembler()
 	ResolveLabelReferences();
 }
 
-unsigned int CMIPSAssembler::GetProgramSize()
+unsigned int CMIPSAssembler::GetProgramSize() const
 {
 	return static_cast<unsigned int>(m_ptr - m_startPtr);
 }
diff --git a/Source/MIPSAssembler.h b/Source/MIPSAssembler.h
index 34648c8d2..070e5381b 100644
--- a/Source/MIPSAssembler.h
+++ b/Source/MIPSAssembler.h
@@ -19,7 +19,7 @@ public:
 	CMIPSAssembler(uint32*);
 	~CMIPSAssembler();
 
-	unsigned int GetProgramSize();
+	unsigned int GetProgramSize() const;
 	LABEL CreateLabel();
 	void MarkLabel(LABEL);