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We find that $ -0.14 \\times 10^{-2} < (C_T + C^\\prime_T)/C_A < 1.4 \\times 10^{-2} $ and $ -0.16 < (C_T - C^\\prime_T)/C_A < 0.16$ (90% C.L.), while for the case $C_T = C^\\prime_T$ the limits are $ | C_T/C_A | < 3.7 \\times 10^{-3} $. These limits are shown to be more stringent than those from recent measurements of the radiative pion decay. 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