diff --git a/effects/shaders/gaussianblur.frag b/effects/shaders/gaussianblur.frag
index 80aaedb18..da83e1389 100644
--- a/effects/shaders/gaussianblur.frag
+++ b/effects/shaders/gaussianblur.frag
@@ -4,7 +4,7 @@
 
 uniform sampler2D image;
 
-// uniform float radius;
+uniform float radius;
 uniform float sigma;
 uniform vec2 resolution;
 uniform bool horiz_blur;
@@ -22,13 +22,13 @@ float gaussian2(float x, float y, float sigma) {
 }
 
 void main(void) {
-	float rad = ceil(sigma);
+	float rad = ceil(radius);
 
 	float sum = 0.0;
 
 	vec4 color = vec4(0.0);
 
-	bool radius_is_zero = (rad == 0.0);
+	bool radius_is_zero = (rad == 0.0 || sigma == 0.0);
 
 	if (!radius_is_zero) {
 		for (float x=-rad+0.5;x<=rad;x+=2.0) {
diff --git a/effects/shaders/gaussianblur.xml b/effects/shaders/gaussianblur.xml
index d0d669f6d..def19b73e 100644
--- a/effects/shaders/gaussianblur.xml
+++ b/effects/shaders/gaussianblur.xml
@@ -1,8 +1,8 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <effect name="Gaussian Blur" category="Blur">
-	<!-- <row name="Radius">
+	<row name="Radius">
 		<field type="double" min="0" default="10" id="radius"/>
-	</row> -->
+	</row>
 	<row name="Sigma">
 		<field type="double" min="0" default="5.5" id="sigma"/>
 	</row>