diff --git a/doc/filters.texi b/doc/filters.texi
index 9b1d56bc5a..cfc7ecb6e5 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1197,10 +1197,6 @@ alpha component
 The expressions can contain the following constants and functions:
 
 @table @option
-@item E, PI, PHI
-the corresponding mathematical approximated values for e
-(euler number), pi (greek PI), PHI (golden ratio)
-
 @item w, h
 the input width and heigth
 
diff --git a/libavfilter/vf_lut.c b/libavfilter/vf_lut.c
index 15f2c774f8..82003dff09 100644
--- a/libavfilter/vf_lut.c
+++ b/libavfilter/vf_lut.c
@@ -31,9 +31,6 @@
 #include "internal.h"
 
 static const char *var_names[] = {
-    "E",
-    "PHI",
-    "PI",
     "w",        ///< width of the input video
     "h",        ///< height of the input video
     "val",      ///< input value for the pixel
@@ -45,9 +42,6 @@ static const char *var_names[] = {
 };
 
 enum var_name {
-    VAR_E,
-    VAR_PHI,
-    VAR_PI,
     VAR_W,
     VAR_H,
     VAR_VAL,
@@ -115,10 +109,6 @@ static int init(AVFilterContext *ctx, const char *args, void *opaque)
     lut->class = &lut_class;
     av_opt_set_defaults(lut);
 
-    lut->var_values[VAR_PHI] = M_PHI;
-    lut->var_values[VAR_PI]  = M_PI;
-    lut->var_values[VAR_E ]  = M_E;
-
     lut->is_rgb = !strcmp(ctx->filter->name, "lutrgb");
     lut->is_yuv = !strcmp(ctx->filter->name, "lutyuv");
     if (args && (ret = av_set_options_string(lut, args, "=", ":")) < 0)