diff --git a/inc/A_extension.h b/inc/A_extension.h
index 6fab905..96d4e5a 100644
--- a/inc/A_extension.h
+++ b/inc/A_extension.h
@@ -67,39 +67,6 @@ public:
 		return m_instr.range(31, 27);
 	}
 
-
-	/**
-	 * @brief Access to rs1 field
-	 * @return rs1 field
-	 */
-	inline int32_t get_rs1() const override {
-		return m_instr.range(19, 15);
-	}
-
-	inline void set_rs1(int32_t value) override {
-		m_instr.range(19, 15) = value;
-	}
-
-	/**
-	 * @brief Access to rs2 field
-	 * @return rs2 field
-	 */
-	inline int32_t get_rs2() const override {
-		return m_instr.range(24, 20);
-	}
-
-	inline void set_rs2(int32_t value) override {
-		m_instr.range(24, 20) = value;
-	}
-
-	inline int32_t get_funct3() const override {
-		return m_instr.range(14, 12);
-	}
-
-	inline void set_funct3(int32_t value) override {
-		m_instr.range(14, 12) = value;
-	}
-
 	/**
 	 * @brief Decodes opcode of instruction
 	 * @return opcode of instruction
diff --git a/inc/BASE_ISA.h b/inc/BASE_ISA.h
index 06527ad..f981b40 100644
--- a/inc/BASE_ISA.h
+++ b/inc/BASE_ISA.h
@@ -100,54 +100,6 @@ public:
 	 */
 	using extension_base::extension_base;
 
-	/**
-	 * @brief Access to rs1 field
-	 * @return rs1 field
-	 */
-	inline int32_t get_rs1() const override {
-		return m_instr.range(19, 15);
-	}
-
-	/**
-	 * @brief Sets rs1 field
-	 * @param value desired rs1 value
-	 */
-	inline void set_rs1(int32_t value) override {
-		m_instr.range(19, 15) = value;
-	}
-
-	/**
-	 * @brief Access to rs2 field
-	 * @return rs2 field
-	 */
-	inline int32_t get_rs2() const override {
-		return m_instr.range(24, 20);
-	}
-
-	/**
-	 * @brief Sets rs2 field
-	 * @param value desired rs2 value
-	 */
-	inline void set_rs2(int32_t value) override {
-		m_instr.range(24, 10) = value;
-	}
-
-	/**
-	 * @brief Access to funct3 field
-	 * @return funct3 field
-	 */
-	inline int32_t get_funct3() const override {
-		return m_instr.range(14, 12);
-	}
-
-	/**
-	 * @brief Sets func3 field
-	 * @param value desired func3 value
-	 */
-	inline void set_funct3(int32_t value) override {
-		m_instr.range(14, 12) = value;
-	}
-
 	/**
 	 * @brief Access to funct7 field
 	 * @return funct7 field
diff --git a/inc/M_extension.h b/inc/M_extension.h
index d030c94..6f9fe0e 100644
--- a/inc/M_extension.h
+++ b/inc/M_extension.h
@@ -81,37 +81,6 @@ private:
 		return m_instr.range(14, 12);
 	}
 
-	/**
-	 * @brief Access to rs1 field
-	 * @return rs1 field
-	 */
-	inline int32_t get_rs1() const {
-		return m_instr.range(19, 15);
-	}
-
-	inline void set_rs1(int32_t value) {
-		m_instr.range(19, 15) = value;
-	}
-
-	/**
-	 * @brief Access to rs2 field
-	 * @return rs2 field
-	 */
-	inline int32_t get_rs2() const {
-		return m_instr.range(24, 20);
-	}
-
-	inline void set_rs2(int32_t value) {
-		m_instr.range(24, 20) = value;
-	}
-
-	inline int32_t get_funct3() const {
-		return m_instr.range(14, 12);
-	}
-
-	inline void set_funct3(int32_t value) {
-		m_instr.range(14, 12) = value;
-	}
 };
 
 #endif
diff --git a/inc/extension_base.h b/inc/extension_base.h
index 2a9a085..b8caf1f 100644
--- a/inc/extension_base.h
+++ b/inc/extension_base.h
@@ -36,18 +36,38 @@ public:
 
 	/* pure virtual functions */
 	virtual int32_t opcode() const = 0;
+
 	virtual int32_t get_rd() const {
 	    return m_instr.range(11, 7);
 	}
+
 	virtual void set_rd(int32_t value) {
     m_instr.range(11, 7) = value;
 	}
-	virtual int32_t get_rs1() const = 0;
-	virtual void set_rs1(int32_t value) = 0;
-	virtual int32_t get_rs2() const = 0;
-	virtual void set_rs2(int32_t value) = 0;
-	virtual int32_t get_funct3() const = 0;
-	virtual void set_funct3(int32_t value) = 0;
+
+	virtual int32_t get_rs1() const {
+    return m_instr.range(19, 15);
+	}
+
+	virtual void set_rs1(int32_t value) {
+	  m_instr.range(19, 15) = value;
+	}
+
+	virtual int32_t get_rs2() const {
+	  return m_instr.range(24, 20);
+	}
+
+	virtual void set_rs2(int32_t value) {
+    m_instr.range(24, 20) = value;
+	}
+
+	virtual int32_t get_funct3() const {
+    return m_instr.range(14, 12);
+	}
+
+	virtual void set_funct3(int32_t value) {
+	  m_instr.range(14, 12) = value;
+	}
 
 	virtual void dump() const;