diff --git a/engine/joint/v4k.h b/engine/joint/v4k.h
index 270a910..d6b0651 100644
--- a/engine/joint/v4k.h
+++ b/engine/joint/v4k.h
@@ -374035,10 +374035,10 @@ static const char *dd_fs = "//" FILELINE "\n"
     // "precision mediump float;\n"
     "in vec3 out_color;\n"
     "out vec4 fragcolor;\n"
-    "uniform float gamma; /// set:2.2\n"
+    "uniform float u_gamma; /// set:2.2\n"
     "void main() {\n"
     "   fragcolor = vec4(out_color, 1.0);\n"
-    "   fragcolor.rgb = pow(fragcolor.rgb, vec3(gamma));\n"
+    "   fragcolor.rgb = pow(fragcolor.rgb, vec3(u_gamma));\n"
     "}";
 
 #define X(x) RGBX(x,255)
diff --git a/engine/split/v4k_renderdd.c b/engine/split/v4k_renderdd.c
index 78ad637..5d6b2f0 100644
--- a/engine/split/v4k_renderdd.c
+++ b/engine/split/v4k_renderdd.c
@@ -13,10 +13,10 @@ static const char *dd_fs = "//" FILELINE "\n"
     // "precision mediump float;\n"
     "in vec3 out_color;\n"
     "out vec4 fragcolor;\n"
-    "uniform float gamma; /// set:2.2\n"
+    "uniform float u_gamma; /// set:2.2\n"
     "void main() {\n"
     "   fragcolor = vec4(out_color, 1.0);\n"
-    "   fragcolor.rgb = pow(fragcolor.rgb, vec3(gamma));\n"
+    "   fragcolor.rgb = pow(fragcolor.rgb, vec3(u_gamma));\n"
     "}";
 
 #define X(x) RGBX(x,255)
diff --git a/engine/v4k.c b/engine/v4k.c
index bcada5f..92b2812 100644
--- a/engine/v4k.c
+++ b/engine/v4k.c
@@ -21190,10 +21190,10 @@ static const char *dd_fs = "//" FILELINE "\n"
     // "precision mediump float;\n"
     "in vec3 out_color;\n"
     "out vec4 fragcolor;\n"
-    "uniform float gamma; /// set:2.2\n"
+    "uniform float u_gamma; /// set:2.2\n"
     "void main() {\n"
     "   fragcolor = vec4(out_color, 1.0);\n"
-    "   fragcolor.rgb = pow(fragcolor.rgb, vec3(gamma));\n"
+    "   fragcolor.rgb = pow(fragcolor.rgb, vec3(u_gamma));\n"
     "}";
 
 #define X(x) RGBX(x,255)