diff --git a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
index 8b78a760c6c..d9e3ca824cd 100644
--- a/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
+++ b/core/org.eclipse.cdt.core.tests/parser/org/eclipse/cdt/core/parser/tests/ast2/AST2Tests.java
@@ -1667,6 +1667,23 @@ public class AST2Tests extends AST2BaseTest {
 		}
 	}
 	
+	// int plainInt = 7;
+	// signed int signedInt = -2;
+	// unsigned int unsignedInt = 99;
+	// noSpec= 12;
+	public void testBug270275_int_is_equivalent_to_signed_int() throws Exception {
+		IASTTranslationUnit tu = parse(getAboveComment(), ParserLanguage.C);
+		IASTDeclaration[] declarations = tu.getDeclarations();
+		IType plainInt = ((IVariable)((IASTSimpleDeclaration)declarations[0]).getDeclarators()[0].getName().resolveBinding()).getType();
+		IType signedInt = ((IVariable)((IASTSimpleDeclaration)declarations[1]).getDeclarators()[0].getName().resolveBinding()).getType();
+		IType unsignedInt = ((IVariable)((IASTSimpleDeclaration)declarations[2]).getDeclarators()[0].getName().resolveBinding()).getType();
+		IType noSpec = ((IVariable)((IASTSimpleDeclaration)declarations[3]).getDeclarators()[0].getName().resolveBinding()).getType();
+		assertTrue(plainInt.isSameType(signedInt));
+		assertFalse(plainInt.isSameType(unsignedInt));
+		assertFalse(signedInt.isSameType(unsignedInt));
+		assertTrue(plainInt.isSameType(noSpec));
+	}
+	
 	// struct A {} a1;              
 	// typedef struct A * AP;       
 	// struct A * const a2;         
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CBasicType.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CBasicType.java
index 3a9cdb91694..fbb00716f76 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CBasicType.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/c/CBasicType.java
@@ -127,14 +127,16 @@ public class CBasicType implements ICBasicType {
 		
 		CBasicType cObj = (CBasicType)obj;
 		
-		return (cObj.getType() == this.getType()
-				&& cObj.isLong() == this.isLong() 
-				&& cObj.isShort() == this.isShort() 
-				&& cObj.isSigned() == this.isSigned() 
-				&& cObj.isUnsigned() == this.isUnsigned()
-				&& cObj.isLongLong() == this.isLongLong()
-				&& cObj.isComplex() == this.isComplex() 
-				&& cObj.isImaginary() == this.isImaginary());
+		if (type != cObj.type) {
+			return false;
+		}
+		
+		if (type == IBasicType.t_int) {
+			//signed int and int are equivalent
+			return (qualifiers & ~IS_SIGNED) == (cObj.qualifiers & ~IS_SIGNED);
+		} else {
+			return (qualifiers == cObj.qualifiers);
+		}
 	}
 	
     @Override
diff --git a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPBasicType.java b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPBasicType.java
index 0fb977363d8..82e536ef385 100644
--- a/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPBasicType.java
+++ b/core/org.eclipse.cdt.core/parser/org/eclipse/cdt/internal/core/dom/parser/cpp/CPPBasicType.java
@@ -64,7 +64,7 @@ public class CPPBasicType implements ICPPBasicType {
 			//signed int and int are equivalent
 			return (qualifierBits & ~IS_SIGNED) == (t.qualifierBits & ~IS_SIGNED);
 		}
-		return (type == t.type && qualifierBits == t.qualifierBits);
+		return qualifierBits == t.qualifierBits;
 	}
 
 	/* (non-Javadoc)