diff --git a/common/core/web/keyboard-processor/src/text/kbdInterface.ts b/common/core/web/keyboard-processor/src/text/kbdInterface.ts
index bf8dad08d7..5bb27e1841 100644
--- a/common/core/web/keyboard-processor/src/text/kbdInterface.ts
+++ b/common/core/web/keyboard-processor/src/text/kbdInterface.ts
@@ -882,7 +882,8 @@ namespace com.keyman.text {
      */
     setStore(systemId: number, strValue: string, outputTarget: OutputTarget): boolean {
       this.resetContextCache();
-      if(systemId == KeyboardInterface.TSS_LAYER) {
+      // Unique case:  we only allow set-store ops from keyboard rules triggered by touch OSKs.
+      if(systemId == KeyboardInterface.TSS_LAYER && this.activeDevice.touchable) {
         // Denote the changed store as part of the matched rule's behavior.
         this.ruleBehavior.setStore[systemId] = strValue;
       } else {