diff --git a/release-notes.md b/release-notes.md
index 8f2476a1..e94624e1 100644
--- a/release-notes.md
+++ b/release-notes.md
@@ -7,6 +7,8 @@ Version 1.16.1 (unreleased)
 * Added a Panel(ElementId) constructor.
 * Slight change to popup layer placement to only move out and never in
     even if the calculated popup z-offset is positive.
+* Properly clear alpha discard param in QuadBackgroundComponent and
+    IconComponent when alpha discard is disabled (is set to 0).
     
 
 Version 1.16.0 (latest)
diff --git a/src/main/java/com/simsilica/lemur/component/IconComponent.java b/src/main/java/com/simsilica/lemur/component/IconComponent.java
index 2cc7b487..8c9a5399 100644
--- a/src/main/java/com/simsilica/lemur/component/IconComponent.java
+++ b/src/main/java/com/simsilica/lemur/component/IconComponent.java
@@ -322,7 +322,11 @@ public void setAlphaDiscard( float alphaDiscard ) {
         }
         this.alphaDiscard = alphaDiscard;
         if( material != null ) {
-            material.getMaterial().setFloat("AlphaDiscardThreshold", alphaDiscard);
+            if( alphaDiscard == 0 ) {
+                material.getMaterial().clearParam("AlphaDiscardThreshold");
+            } else {
+                material.getMaterial().setFloat("AlphaDiscardThreshold", alphaDiscard);
+            }
         }
     }
 
@@ -448,7 +452,9 @@ protected void createIcon() {
             material.setTexture(image);
 
             material.getMaterial().getAdditionalRenderState().setBlendMode(BlendMode.Alpha);
-            material.getMaterial().setFloat("AlphaDiscardThreshold", alphaDiscard);
+            if( alphaDiscard > 0 ) {
+                material.getMaterial().setFloat("AlphaDiscardThreshold", alphaDiscard);
+            }
         }
 
         icon.setMaterial(material.getMaterial());
diff --git a/src/main/java/com/simsilica/lemur/component/QuadBackgroundComponent.java b/src/main/java/com/simsilica/lemur/component/QuadBackgroundComponent.java
index 4c320255..eb0c938b 100644
--- a/src/main/java/com/simsilica/lemur/component/QuadBackgroundComponent.java
+++ b/src/main/java/com/simsilica/lemur/component/QuadBackgroundComponent.java
@@ -237,7 +237,11 @@ public void setAlphaDiscard( float alphaDiscard ) {
         }
         this.alphaDiscard = alphaDiscard;
         if( material != null ) {
-            material.getMaterial().setFloat("AlphaDiscardThreshold", alphaDiscard);
+            if( alphaDiscard == 0 ) {
+                material.getMaterial().clearParam("AlphaDiscardThreshold");
+            } else {
+                material.getMaterial().setFloat("AlphaDiscardThreshold", alphaDiscard);
+            }
         }
     }
 
@@ -274,7 +278,9 @@ protected void createMaterial() {
             material.setTexture(texture);
         }
         material.getMaterial().getAdditionalRenderState().setBlendMode(BlendMode.Alpha);
-        material.getMaterial().setFloat("AlphaDiscardThreshold", alphaDiscard);
+        if( alphaDiscard > 0 ) {
+            material.getMaterial().setFloat("AlphaDiscardThreshold", alphaDiscard);
+        }
     }
 
     protected void refreshBackground( Vector3f size ) {