diff --git a/src/main/java/TrueFXTickEvent.java b/src/main/java/TrueFXTickEvent.java
index eafed06..f49ecd3 100644
--- a/src/main/java/TrueFXTickEvent.java
+++ b/src/main/java/TrueFXTickEvent.java
@@ -48,7 +48,7 @@ public class TrueFXTickEvent extends TickEvent {
      * @param instrument the instrument to set
      */
     public void setInstrument(String instrument) {
-        this.instrument = instrument;
+        this.instrument = fixName(instrument);
     }
 
     /**
@@ -89,6 +89,14 @@ public class TrueFXTickEvent extends TickEvent {
         return getMid(ask, bid);
     }
 
+    /**
+     * Convert from "EUR/USD" format to "EUR_USD" to match what OANDA
+     * uses.
+     */
+    private String fixName(String n) {
+        return n.replace('/', '_');
+    }
+
     /**
      * Return a human readable representation of this event.
      */