diff --git a/Makefile.dev b/Makefile.dev
index a37b81d..0932c59 100644
--- a/Makefile.dev
+++ b/Makefile.dev
@@ -206,7 +206,6 @@ glsl-glyphs: ## glsl-glyphs
 		--name cp437 \
 		--functions \
 		--includes \
-		--add-all \
 		--input sample/cp437_8x8.png \
 		--glyph-names sample/cp437_names.txt \
 		--sets sample/cp437_sets.csv \
diff --git a/default/inc_cp437.glsl b/default/inc_cp437.glsl
index 84c4a73..0b119b8 100644
--- a/default/inc_cp437.glsl
+++ b/default/inc_cp437.glsl
@@ -262,10 +262,9 @@ const int cp437_glyphs[] = int[1024](
     0x22E0, 0x4470, 0x0E22, 0x0744  // 0xFF, NBSP
 );
 
-#define CP437_SETS 10
+#define CP437_SETS 9
 
-const int cp437_sets[] = int[20](
-    0x00, 256,  // ALL
+const int cp437_sets[] = int[18](
     0x30, 10,   // NUMBERS
     0x41, 26,   // UPPERCASE LETTERS
     0x61, 26,   // LOWERCASE LETTERS
diff --git a/default/inc_src.glsl b/default/inc_src.glsl
index 9da653f..31f2e3e 100644
--- a/default/inc_src.glsl
+++ b/default/inc_src.glsl
@@ -196,8 +196,9 @@ subroutine(src_stage_sub) vec4 src_7(vec2 vUV, int seed, vec3 b1, vec2 f1, vec3
     uv2 *= zoom * 20. + 3.;
     uv2 += iBeats;
     uv2 = mod(uv2, 100.) + 100.;
-    int start_char = charset_ctrl.x > 0. ? cp437_sets[int(charset.x * CP437_SETS) * 2] : 0x01;
-    int char_span = int((charset_ctrl.x > 0. ? cp437_sets[int(charset.x * CP437_SETS) * 2 + 1] : 255));
+    int charset_index = int(charset.x * (CP437_SETS - 1));
+    int start_char = charset_ctrl.x > 0. ? cp437_sets[charset_index * 2] : 0x01;
+    int char_span = int((charset_ctrl.x > 0. ? cp437_sets[charset_index * 2 + 1] : 255));
     char_span = int(char_span * max(1. - charset.y, 1. / (char_span * .75)));
     ivec2 uv2i = ivec2(uv2);
     int code = ((charset_ctrl.y < 1. || (uv2i.x % 2 ^ uv2i.y % 2) > 0) ? 1 : 0) * (start_char + int((rand(uv2i) + char_delta) * char_span) % char_span);