diff --git a/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/basic/CheckResultSetRule.java b/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/basic/CheckResultSetRule.java
index 827ab58e0c..60f6fc92d0 100644
--- a/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/basic/CheckResultSetRule.java
+++ b/pmd-java/src/main/java/net/sourceforge/pmd/lang/java/rule/basic/CheckResultSetRule.java
@@ -12,6 +12,7 @@ import net.sourceforge.pmd.lang.ast.Node;
 import net.sourceforge.pmd.lang.java.ast.ASTClassOrInterfaceType;
 import net.sourceforge.pmd.lang.java.ast.ASTIfStatement;
 import net.sourceforge.pmd.lang.java.ast.ASTLocalVariableDeclaration;
+import net.sourceforge.pmd.lang.java.ast.ASTMethodDeclaration;
 import net.sourceforge.pmd.lang.java.ast.ASTName;
 import net.sourceforge.pmd.lang.java.ast.ASTType;
 import net.sourceforge.pmd.lang.java.ast.ASTVariableDeclarator;
@@ -35,7 +36,13 @@ public class CheckResultSetRule extends AbstractJavaRule {
         methods.add(".last");
         methods.add(".first");
     }
-    
+
+    @Override
+    public Object visit(ASTMethodDeclaration node, Object data) {
+        resultSetVariables.clear();
+        return super.visit(node, data);
+    }
+
     @Override
     public Object visit(ASTLocalVariableDeclaration node, Object data) {
         ASTClassOrInterfaceType type = node.getFirstChildOfType(ASTType.class).getFirstDescendantOfType(ASTClassOrInterfaceType.class);
diff --git a/pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/rule/basic/xml/CheckResultSet.xml b/pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/rule/basic/xml/CheckResultSet.xml
index 53e287a88a..415ffa177f 100644
--- a/pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/rule/basic/xml/CheckResultSet.xml
+++ b/pmd-java/src/test/resources/net/sourceforge/pmd/lang/java/rule/basic/xml/CheckResultSet.xml
@@ -284,6 +284,27 @@ public class Foo {
         }
         return result;
     }
+}
+        ]]></code>
+    </test-code>
+    <test-code>
+        <description>#1263 PMD reports CheckResultSet violation in completely unrelated source files.</description>
+        <expected-problems>0</expected-problems>
+        <code><![CDATA[
+import java.sql.ResultSet;
+
+public class Foo {
+    public void firstMethod() {
+        ResultSet results = stmt.executeQuery();
+        if (results.next()) {
+            // do something
+        }
+    }
+
+    public void secondMethod() {
+        MyIterator results = getMyResultsIterator();
+        results.next();
+    }
 }
         ]]></code>
     </test-code>
diff --git a/src/site/markdown/overview/changelog.md b/src/site/markdown/overview/changelog.md
index 59182fed68..4151fa9b3a 100644
--- a/src/site/markdown/overview/changelog.md
+++ b/src/site/markdown/overview/changelog.md
@@ -10,4 +10,5 @@
 
 **Bugfixes:**
 
+* [#1263](https://sourceforge.net/p/pmd/bugs/1263/): PMD reports CheckResultSet violation in completely unrelated source files.
 * [#1273](https://sourceforge.net/p/pmd/bugs/1273/): CheckResultSet false positive in try-with-resources nested in if