diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexCPPBindingResolutionTest.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexCPPBindingResolutionTest.java
index 69556dc8e4a..e5af56fd4d8 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexCPPBindingResolutionTest.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/internal/index/tests/IndexCPPBindingResolutionTest.java
@@ -1758,6 +1758,20 @@ public class IndexCPPBindingResolutionTest extends IndexBindingResolutionTestBas
 		assertEquals("void (char)", ASTTypeUtil.getType(ref.getType()));
 		getBindingFromASTName("g(1)", 1);
 	}
+	
+	//	namespace std {
+	//	    inline namespace __cxx11 { }
+	//	}
+	
+	//	namespace std {
+	//	    namespace __cxx11 {
+	//	        class string {};
+	//	    }
+	//	    void regex_match(string);  // Type 'string' could not be resolved
+	//	}
+	public void testInlineNamespaceReopenedWithoutInlineKeyword_483824() {
+		checkBindings();
+	}
 
 	//	namespace ns {
 	//		void fun();
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPScope.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPScope.java
index 0a63f033508..0152fb0b17a 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPScope.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPScope.java
@@ -307,8 +307,8 @@ abstract public class CPPScope implements ICPPASTInternalScope {
 	@Override
 	public final void populateCache() {
 		if (!isCached) {
+			isCached= true;  // set to true before doing the work, to avoid recursion
 			CPPSemantics.populateCache(this);
-			isCached= true;
 		}
 	}
 
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
index cb49e16ea86..3eb9d85df60 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/semantics/CPPSemantics.java
@@ -1612,7 +1612,15 @@ public class CPPSemantics {
 			} else if (item instanceof ICPPASTNamespaceDefinition) {
 				final ICPPASTNamespaceDefinition nsDef = (ICPPASTNamespaceDefinition) item;
 				final boolean isUnnamed = nsDef.getName().getLookupKey().length == 0;
-				final boolean isInline = nsDef.isInline();
+				boolean isInline = nsDef.isInline();
+				// An inline namespace can be re-opened without repeating the inline keyword,
+				// so we need to consult the binding to check inlineness. 
+				if (!isUnnamed && !isInline) {
+					IBinding nsBinding = nsDef.getName().resolveBinding();
+					if (nsBinding instanceof ICPPNamespace) {
+						isInline = ((ICPPNamespace) nsBinding).isInline();
+					}
+				}
 				if (isUnnamed || isInline) {
 					if (scope instanceof CPPNamespaceScope) {
 						final CPPNamespaceScope nsscope = (CPPNamespaceScope) scope;