diff --git a/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/calltree/CallNode.java b/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/calltree/CallNode.java
index a52185d5d4..6394cf6f85 100644
--- a/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/calltree/CallNode.java
+++ b/Ghidra/Features/Base/src/main/java/ghidra/app/plugin/core/calltree/CallNode.java
@@ -141,4 +141,28 @@ public abstract class CallNode extends GTreeSlowLoadingNode {
 		}
 		return false;
 	}
+
+	// overridden since we may have multiple children with the same function name, but in 
+	// different namespaces
+	@Override
+	public boolean equals(Object obj) {
+		if (this == obj) {
+			return true;
+		}
+		if (obj == null) {
+			return false;
+		}
+		if (getClass() != obj.getClass()) {
+			return false;
+		}
+
+		CallNode other = (CallNode) obj;
+		return getSourceAddress().equals(other.getSourceAddress());
+	}
+
+	@Override
+	public int hashCode() {
+		return getSourceAddress().hashCode();
+	}
+
 }
diff --git a/Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/calltree/CallTreePluginTest.java b/Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/calltree/CallTreePluginTest.java
index a1e3d67af5..afcbd9a6ba 100644
--- a/Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/calltree/CallTreePluginTest.java
+++ b/Ghidra/Features/Base/src/test.slow/java/ghidra/app/plugin/core/calltree/CallTreePluginTest.java
@@ -42,6 +42,7 @@ import ghidra.app.plugin.core.codebrowser.CodeBrowserPlugin;
 import ghidra.app.plugin.core.gotoquery.GoToServicePlugin;
 import ghidra.app.services.GoToService;
 import ghidra.app.services.ProgramManager;
+import ghidra.app.util.NamespaceUtils;
 import ghidra.framework.plugintool.PluginTool;
 import ghidra.program.database.ProgramBuilder;
 import ghidra.program.database.ProgramDB;
@@ -158,6 +159,10 @@ public class CallTreePluginTest extends AbstractGhidraHeadedIntegrationTest {
 		}
 	}
 
+	private Function function(int addr) throws Exception {
+		return ensureFunction(addr);
+	}
+
 	private void function(int from, int to) throws Exception {
 		ensureFunction(from);
 		ensureFunction(to);
@@ -168,16 +173,39 @@ public class CallTreePluginTest extends AbstractGhidraHeadedIntegrationTest {
 		}
 	}
 
-	private void ensureFunction(long from) throws Exception {
+	private Function function(String namespace, String name, int addr) throws Exception {
+		Function f = ensureFunction(addr);
+		tx(program, () -> {
+
+			f.setName(name, SourceType.ANALYSIS);
+			Namespace ns = NamespaceUtils.createNamespaceHierarchy(namespace, null, program,
+				SourceType.ANALYSIS);
+			f.setParentNamespace(ns);
+		});
+
+		return f;
+	}
+
+	private void function(Function from, Function to) {
+
+		// a bit of space so the function call is not at the entry point
+		int offset = (int) from.getEntryPoint().getOffset() + 5;
+		int toOffset = (int) to.getEntryPoint().getOffset();
+		while (!createReference(offset, toOffset)) {
+			offset++;
+		}
+	}
+
+	private Function ensureFunction(long from) throws Exception {
 		ProgramDB p = builder.getProgram();
 		FunctionManager fm = p.getFunctionManager();
 		Function f = fm.getFunctionAt(addr(from));
 		if (f != null) {
-			return;
+			return f;
 		}
 
 		String a = Long.toHexString(from);
-		builder.createEmptyFunction("Function_" + a, "0x" + a, 50, DataType.DEFAULT);
+		return builder.createEmptyFunction("Function_" + a, "0x" + a, 50, DataType.DEFAULT);
 	}
 
 	private boolean createReference(long from, long to) {
@@ -580,12 +608,10 @@ public class CallTreePluginTest extends AbstractGhidraHeadedIntegrationTest {
 
 		setProviderFunction("0x5000");
 
-		final ToggleDockingAction filterDuplicatesAction =
+		ToggleDockingAction filterDuplicatesAction =
 			(ToggleDockingAction) getAction("Filter Duplicates");
 
-		if (!filterDuplicatesAction.isSelected()) {
-			performAction(filterDuplicatesAction, true);
-		}
+		setToggleActionSelected(filterDuplicatesAction, new ActionContext(), true);
 
 		waitForTree(outgoingTree);
 		GTreeNode rootNode = getRootNode(outgoingTree);
@@ -597,8 +623,7 @@ public class CallTreePluginTest extends AbstractGhidraHeadedIntegrationTest {
 		// copy the names of the children into a map so that we can verify that there are 
 		// no duplicates
 		boolean shouldHaveDuplicates = false;
-		Map<String, Integer> nameCountMap = createNameCountMap(rootNode);
-		System.out.println("nameCountMap: before: = " + nameCountMap);
+		Map<GTreeNode, Integer> nameCountMap = createNameCountMap(rootNode);
 		assertDuplicateChildStatus(nameCountMap, shouldHaveDuplicates);
 
 		performAction(filterDuplicatesAction, true);// deselect
@@ -608,7 +633,47 @@ public class CallTreePluginTest extends AbstractGhidraHeadedIntegrationTest {
 		rootNode = getRootNode(outgoingTree);
 		nameCountMap = createNameCountMap(rootNode);
 		shouldHaveDuplicates = true;
-		System.out.println("nameCountMap: after: = " + nameCountMap);
+		assertDuplicateChildStatus(nameCountMap, shouldHaveDuplicates);
+	}
+
+	@Test
+	public void testFilterIncomingDuplicates_SameFunctionNameInDifferentNamespaces()
+			throws Exception {
+
+		/*
+		Create a function call tree that looks like:
+		
+		
+			NS1::Foo
+					root
+			NS2::Foo
+					root
+					
+				 */
+
+		Function f1 = function("NS1", "Foo", 0x11000);
+		Function f2 = function("NS2", "Foo", 0x12000);
+		Function root = function(0x0000);
+		function(f1, root);
+		function(f2, root);
+
+		setProviderFunction("0x0000");
+
+		ToggleDockingAction filterDuplicatesAction =
+			(ToggleDockingAction) getAction("Filter Duplicates");
+		setToggleActionSelected(filterDuplicatesAction, new ActionContext(), true);
+		waitForTree(incomingTree);
+
+		GTreeNode rootNode = getRootNode(incomingTree);
+		List<GTreeNode> children = rootNode.getChildren();
+		assertTrue(
+			"Outgoing tree does not have callers as expected for function: " + getListingFunction(),
+			children.size() > 0);
+
+		// copy the names of the children into a map so that we can verify that there are 
+		// no duplicates
+		boolean shouldHaveDuplicates = false;
+		Map<GTreeNode, Integer> nameCountMap = createNameCountMap(rootNode);
 		assertDuplicateChildStatus(nameCountMap, shouldHaveDuplicates);
 	}
 
@@ -1071,27 +1136,26 @@ public class CallTreePluginTest extends AbstractGhidraHeadedIntegrationTest {
 		return codeBrowserPlugin.getCurrentAddress();
 	}
 
-	private Map<String, Integer> createNameCountMap(GTreeNode node) {
-		Map<String, Integer> map = new HashMap<>();
+	private Map<GTreeNode, Integer> createNameCountMap(GTreeNode node) {
+		Map<GTreeNode, Integer> map = new HashMap<>();
 		List<GTreeNode> children = node.getChildren();
 		for (GTreeNode child : children) {
-			String name = child.getName();
-			Integer integer = map.get(name);
+			Integer integer = map.get(child);
 			if (integer == null) {
 				integer = 0;
 			}
 			int asInt = integer;
 			asInt++;
-			map.put(name, asInt);
+			map.put(child, asInt);
 		}
 		return map;
 	}
 
-	private void assertDuplicateChildStatus(Map<String, Integer> childCountMap,
+	private void assertDuplicateChildStatus(Map<GTreeNode, Integer> childCountMap,
 			boolean shouldHaveDuplicates) {
 		boolean foundDuplicates = false;
-		Set<Entry<String, Integer>> entrySet = childCountMap.entrySet();
-		for (Entry<String, Integer> entry : entrySet) {
+		Set<Entry<GTreeNode, Integer>> entrySet = childCountMap.entrySet();
+		for (Entry<GTreeNode, Integer> entry : entrySet) {
 			int value = entry.getValue();
 			if (value != 1) {
 				foundDuplicates = true;