diff --git a/bundles/org.eclipse.core.net/src/org/eclipse/core/internal/net/ProxyType.java b/bundles/org.eclipse.core.net/src/org/eclipse/core/internal/net/ProxyType.java
index d4e5c6d..955bfb1 100644
--- a/bundles/org.eclipse.core.net/src/org/eclipse/core/internal/net/ProxyType.java
+++ b/bundles/org.eclipse.core.net/src/org/eclipse/core/internal/net/ProxyType.java
@@ -533,7 +533,10 @@
 	}
 
 	public void initialize() {
-		updateSystemProperties(getProxyData(VERIFY_EMPTY));
+		// On mac, the system proxy configuration is set by the JVM automatically
+		boolean isMac = "macosx".equals(System.getProperty("osgi.os"));  //$NON-NLS-1$//$NON-NLS-2$
+		int verify = isMac ? DO_NOT_VERIFY : VERIFY_EMPTY;
+		updateSystemProperties(getProxyData(verify));
 		preferenceManager.addNodeChangeListener(PREF_PROXY_DATA_NODE, this);
 		preferenceManager.addPreferenceChangeListener(getPreferenceNode(), this);
 	}