diff --git a/core/src/main/java/io/opentelemetry/android/export/RateLimitedExporter.java b/core/src/main/java/io/opentelemetry/android/export/RateLimitedExporter.java
index b4e5372a3..bbbc4cea3 100644
--- a/core/src/main/java/io/opentelemetry/android/export/RateLimitedExporter.java
+++ b/core/src/main/java/io/opentelemetry/android/export/RateLimitedExporter.java
@@ -59,7 +59,7 @@ public CompletableResultCode export(Collection<SpanData> spans) {
     }
 
     private boolean canExport(long spanSize) {
-        long currentTime = System.currentTimeMillis();
+        long currentTime = SystemTime.get().getCurrentTimeMillis();
         if (currentTime - lastExportTime > timeWindowInMillis) {
             // Reset the window
             bytesExportedInWindow = 0;
@@ -87,26 +87,26 @@ public CompletableResultCode shutdown() {
 
     static class Builder {
         final SpanExporter delegate;
-        CategoryFunction categoryFunction = span -> "default";
-        long maxBytesPerSecond = 1024; // Default to 1 KB/s
-        long timeWindowInMillis = 1000; // Default to 1 second
-
+        private CategoryFunction categoryFunction = span -> "default";
+        private long maxBytesPerSecond = 1024; // Default to 1 KB/s
+        private long timeWindowInMillis = 1000; // Default to 1 second
+    
         private Builder(SpanExporter delegate) {
             this.delegate = delegate;
         }
-
+    
         Builder maxBytesPerSecond(long maxBytesPerSecond) {
             this.maxBytesPerSecond = maxBytesPerSecond;
             return this;
         }
-
+    
         Builder timeWindow(Duration timeWindow) {
             this.timeWindow = timeWindow;
             return this;
         }
-
+    
         BandwidthThrottlingExporter build() {
             return new BandwidthThrottlingExporter(this);
         }
-    }
+    }    
 }