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In this paper we propose an improved fuzzy adaptive control strategy,for a class of nonlinear chaotic fractional order (SISO) systems with unknown control gain sign.The online control algorithm uses fuzzy logic sets for the identification of the fractional order chaotic system,whereas the lack of a priori knowledge on the control directions is solved by introducing a fractional order Nussbaum gain.Based on Lyapunov stability theorem,stability analysis is performed for the proposed control method for an acceptable synchronization error level.In this work,the Griinwald-Letnikov method is used for numerical approximation of the fractional order systems.A simulation example is given to illustrate the effectiveness of the proposed control scheme.