diff --git a/libswscale/options.c b/libswscale/options.c
index 18a6594f65..ac35af7bd8 100644
--- a/libswscale/options.c
+++ b/libswscale/options.c
@@ -75,9 +75,7 @@ static const AVOption swscale_options[] = {
     { "ed",              "error diffusion",               0,                 AV_OPT_TYPE_CONST,  { .i64  = SWS_DITHER_ED      }, INT_MIN, INT_MAX,        VE, "sws_dither" },
     { "a_dither",        "arithmetic addition dither",    0,                 AV_OPT_TYPE_CONST,  { .i64  = SWS_DITHER_A_DITHER}, INT_MIN, INT_MAX,        VE, "sws_dither" },
     { "x_dither",        "arithmetic xor dither",         0,                 AV_OPT_TYPE_CONST,  { .i64  = SWS_DITHER_X_DITHER}, INT_MIN, INT_MAX,        VE, "sws_dither" },
-    { "gamma",           "gamma correct scaling", OFFSET(gamma_flag),        AV_OPT_TYPE_INT,    { .i64  = 0                  }, 0,       INT_MAX,        VE, "gamma" },
-    { "true",            "enable",                        0,                 AV_OPT_TYPE_CONST,  { .i64  = 1                  }, INT_MIN, INT_MAX,        VE, "gamma" },
-    { "false",           "disable",                       0,                 AV_OPT_TYPE_CONST,  { .i64  = 0                  }, INT_MIN, INT_MAX,        VE, "gamma" },
+    { "gamma",           "gamma correct scaling",         OFFSET(gamma_flag),AV_OPT_TYPE_BOOL,   { .i64  = 0                  }, 0,       1,              VE },
     { "alphablend",      "mode for alpha -> non alpha",   OFFSET(alphablend),AV_OPT_TYPE_INT,    { .i64  = SWS_ALPHA_BLEND_NONE}, 0,       SWS_ALPHA_BLEND_NB-1, VE, "alphablend" },
     { "none",            "ignore alpha",                  0,                 AV_OPT_TYPE_CONST,  { .i64  = SWS_ALPHA_BLEND_NONE}, INT_MIN, INT_MAX,       VE, "alphablend" },
     { "uniform_color",   "blend onto a uniform color",    0,                 AV_OPT_TYPE_CONST,  { .i64  = SWS_ALPHA_BLEND_UNIFORM},INT_MIN, INT_MAX,     VE, "alphablend" },