diff --git a/addons/material_maker/nodes/generalized_kuwahara.mmg b/addons/material_maker/nodes/generalized_kuwahara.mmg
index 3603302e8..bc8fab83a 100644
--- a/addons/material_maker/nodes/generalized_kuwahara.mmg
+++ b/addons/material_maker/nodes/generalized_kuwahara.mmg
@@ -210,7 +210,6 @@
 					"// MIT License - Garrett Gunnell",
 					"// Based on https://github.com/GarrettGunnell/Post-Processing/blob/main/Assets/Kuwahara%20Filter/GeneralizedKuwahara.shader",
 					"vec3 $(name)_generalized_kuwahara(vec2 uv, int _KernelSize) {",
-					"\tint k;",
 					"\tvec4 m[8];",
 					"\tvec3 s[8];",
 					"",
@@ -223,7 +222,7 @@
 					"\tfloat sinZeroCross = sin(zeroCross);",
 					"\tfloat eta = (zeta + cos(zeroCross)) / (sinZeroCross * sinZeroCross);",
 					"",
-					"\tfor (k = 0; k < 8; ++k) {",
+					"\tfor (int k = 0; k < 8; ++k) {",
 					"\t\tm[k] = vec4(0.0);",
 					"\t\ts[k] = vec3(0.0);",
 					"\t}",
@@ -269,7 +268,7 @@
 					"\t\t\t",
 					"\t\t\tfloat g = exp(-3.125 * dot(v,v)) / sum;",
 					"\t\t\t",
-					"\t\t   for (k = 0; k < 8; ++k) {",
+					"\t\t   for (int k = 0; k < 8; ++k) {",
 					"\t\t\t\tfloat wk = w[k] * g;",
 					"\t\t\t\tm[k] += vec4(c * wk, wk);",
 					"\t\t\t\ts[k] += c * c * wk;",
@@ -278,7 +277,7 @@
 					"\t}",
 					"",
 					"\tvec4 output = vec4(0.0);",
-					"\t  for (k = 0; k < 8; ++k) {",
+					"\t  for (int k = 0; k < 8; ++k) {",
 					"\t\tm[k].rgb /= m[k].w;",
 					"\t\ts[k] = abs(s[k] / m[k].w - m[k].rgb * m[k].rgb);",
 					"",