diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2CPPTests.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2CPPTests.java
index fa70316b125..3259e16e93b 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2CPPTests.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2CPPTests.java
@@ -9850,6 +9850,20 @@ public class AST2CPPTests extends AST2CPPTestBase {
 		dtor= (IASTImplicitNameOwner) name.getParent();
 		assertSame(ctor3, dtor.getImplicitNames()[0].resolveBinding());
 	}
+	
+	//	struct S {
+	//	    bool a;
+	//	    int b;
+	//	};
+	//
+	//	void waldo(S);
+	//
+	//	int main() {
+	//	    waldo({1, 2});
+	//	}
+	public void testIntToBoolConversionInInitList_521543() throws Exception {
+		parseAndCheckBindings();
+	}
 
 	//	namespace A {
 	//        inline namespace B {
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/ArithmeticConversion.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/ArithmeticConversion.java
index 26728ebdc3c..0c9937daa5b 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/ArithmeticConversion.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/ArithmeticConversion.java
@@ -341,6 +341,9 @@ public abstract class ArithmeticConversion {
 	public static boolean fitsIntoType(IBasicType basicTarget, long n) {
 		final Kind kind = basicTarget.getKind();
 		switch (kind) {
+		case eBoolean:
+			return n == 0 || n == 1;
+			
 		case eInt:
 			if (!basicTarget.isUnsigned()) {
 				if (basicTarget.isShort()) {