diff --git a/logback-classic-blackbox/src/test/blackboxInput/joran/conditional/includeWithVariableAndConditional.xml b/logback-classic-blackbox/src/test/blackboxInput/joran/conditional/includeWithVariableAndConditional.xml
new file mode 100644
index 0000000000..22d43a0ba9
--- /dev/null
+++ b/logback-classic-blackbox/src/test/blackboxInput/joran/conditional/includeWithVariableAndConditional.xml
@@ -0,0 +1,26 @@
+<!--
+  ~ Logback: the reliable, generic, fast and flexible logging framework.
+  ~ Copyright (C) 1999-2024, QOS.ch. All rights reserved.
+  ~
+  ~ This program and the accompanying materials are dual-licensed under
+  ~ either the terms of the Eclipse Public License v1.0 as published by
+  ~ the Eclipse Foundation
+  ~
+  ~   or (per the licensee's choosing)
+  ~
+  ~ under the terms of the GNU Lesser General Public License version 2.1
+  ~ as published by the Free Software Foundation.
+  -->
+
+<configuration>
+
+  
+  <variable scope="system" name="JO_PREFIX" value="src/test/blackboxInput/joran"/>
+  
+  <if condition='isDefined("JO_PREFIX")'>
+    <then>
+      <include file="${JO_PREFIX}/conditional/includedFile.xml"/>
+    </then>
+  </if>
+
+</configuration>
diff --git a/logback-classic-blackbox/src/test/java/ch/qos/logback/classic/blackbox/joran/conditional/ConditionalTest.java b/logback-classic-blackbox/src/test/java/ch/qos/logback/classic/blackbox/joran/conditional/ConditionalTest.java
index 74dbbb8812..8c2cb7b382 100644
--- a/logback-classic-blackbox/src/test/java/ch/qos/logback/classic/blackbox/joran/conditional/ConditionalTest.java
+++ b/logback-classic-blackbox/src/test/java/ch/qos/logback/classic/blackbox/joran/conditional/ConditionalTest.java
@@ -30,6 +30,7 @@
 import ch.qos.logback.core.testUtil.CoreTestConstants;
 import ch.qos.logback.core.testUtil.RandomUtil;
 import ch.qos.logback.core.util.StatusPrinter;
+import ch.qos.logback.core.util.StatusPrinter2;
 import org.junit.jupiter.api.AfterEach;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -51,6 +52,7 @@ public class ConditionalTest {
     Logger root = loggerContext.getLogger(Logger.ROOT_LOGGER_NAME);
 
     Logger logger = loggerContext.getLogger(this.getClass().getName());
+    StatusPrinter2 statusPrinter2 = new StatusPrinter2();
 
     StatusUtil checker = new StatusUtil(loggerContext);
     int diff = RandomUtil.getPositiveInt();
@@ -132,7 +134,7 @@ public void conditionalInclusionWithExistingFile() throws JoranException, IOExce
         String configFileAsStr = BlackboxClassicTestConstants.JORAN_INPUT_PREFIX
                 + "conditional/conditionalIncludeExistingFile.xml";
         configure(configFileAsStr);
-        StatusPrinter.print(loggerContext);
+        //statusPrinter2.print(loggerContext);
 
         ConsoleAppender<ILoggingEvent> consoleAppender = (ConsoleAppender<ILoggingEvent>) root.getAppender("CON");
         assertNotNull(consoleAppender);
@@ -152,6 +154,22 @@ public void conditionalInclusionWithInexistentFile() throws JoranException, IOEx
         assertTrue(checker.isErrorFree(0));
     }
 
+    // https://jira.qos.ch/browse/LOGBACK-1732
+    @Test
+    public void conditionalInclusionWithVariableDefinition() throws JoranException, IOException, InterruptedException {
+
+        String configFileAsStr = BlackboxClassicTestConstants.JORAN_INPUT_PREFIX
+                + "conditional/includeWithVariableAndConditional.xml";
+        configure(configFileAsStr);
+
+        statusPrinter2.print(loggerContext);
+
+        ConsoleAppender<ILoggingEvent> consoleAppender = (ConsoleAppender<ILoggingEvent>) root.getAppender("CON");
+        assertNotNull(consoleAppender);
+        assertTrue(checker.isErrorFree(0));
+    }
+
+
     private AppenderTracker<ILoggingEvent> getAppenderTracker() {
         SiftingAppender ha = (SiftingAppender) root.getAppender("SIFT");
         return ha.getAppenderTracker();
@@ -161,7 +179,7 @@ private AppenderTracker<ILoggingEvent> getAppenderTracker() {
     @Test
     public void nestedWithinIfThen() throws JoranException {
         configure(BlackboxClassicTestConstants.JORAN_INPUT_PREFIX + "conditional/siftNestedWithinIfThen.xml");
-        StatusPrinter.print(loggerContext);
+        //statusPrinter2.print(loggerContext);
         String msg = "nestedWithinIfThen";
         logger.debug(msg);
         Appender<ILoggingEvent> appender = getAppenderTracker().find("ifThenDefault");
@@ -172,4 +190,6 @@ public void nestedWithinIfThen() throws JoranException {
         assertEquals(msg, eventList.get(0).getMessage());
         checker.isWarningOrErrorFree(0);
     }
+
+
 }
diff --git a/logback-classic/src/test/input/joran/include/includeWithVariableAndConditional.xml b/logback-classic/src/test/input/joran/include/includeWithVariableAndConditional.xml
deleted file mode 100644
index e69de29bb2..0000000000
diff --git a/logback-classic/src/test/java/ch/qos/logback/classic/joran/JoranConfiguratorTest.java b/logback-classic/src/test/java/ch/qos/logback/classic/joran/JoranConfiguratorTest.java
index eb51efecb8..44c1b45f5b 100644
--- a/logback-classic/src/test/java/ch/qos/logback/classic/joran/JoranConfiguratorTest.java
+++ b/logback-classic/src/test/java/ch/qos/logback/classic/joran/JoranConfiguratorTest.java
@@ -27,6 +27,7 @@
 import ch.qos.logback.classic.turbo.DebugUsersTurboFilter;
 import ch.qos.logback.classic.turbo.NOPTurboFilter;
 import ch.qos.logback.classic.turbo.TurboFilter;
+import ch.qos.logback.classic.util.LogbackMDCAdapter;
 import ch.qos.logback.core.ConsoleAppender;
 import ch.qos.logback.core.CoreConstants;
 import ch.qos.logback.core.encoder.LayoutWrappingEncoder;
@@ -51,6 +52,7 @@
 import org.junit.jupiter.api.Test;
 import org.slf4j.MDC;
 import org.slf4j.event.KeyValuePair;
+import org.slf4j.spi.MDCAdapter;
 
 import java.io.FileInputStream;
 import java.io.FileNotFoundException;
@@ -72,6 +74,7 @@
 public class JoranConfiguratorTest {
 
     LoggerContext loggerContext = new LoggerContext();
+    MDCAdapter mdcAdapter = new LogbackMDCAdapter();
     Logger logger = loggerContext.getLogger(this.getClass().getName());
     Logger root = loggerContext.getLogger(Logger.ROOT_LOGGER_NAME);
     StatusPrinter2 statusPrinter2 = new StatusPrinter2();
@@ -79,6 +82,7 @@ public class JoranConfiguratorTest {
     int diff = RandomUtil.getPositiveInt();
 
     void configure(String file) throws JoranException {
+        loggerContext.setMDCAdapter(mdcAdapter);
         JoranConfigurator jc = new JoranConfigurator();
         jc.setContext(loggerContext);
         loggerContext.putProperty("diff", "" + diff);
@@ -673,15 +677,15 @@ public void kvp() throws JoranException {
     }
 
 
+    // See LOGBACK-1746
     @Test
     public void inclusionWithVariables() throws JoranException  {
         configure(ClassicTestConstants.JORAN_INPUT_PREFIX + "include/topLevel0.xml");
-
         Logger root = loggerContext.getLogger(Logger.ROOT_LOGGER_NAME);
-        statusPrinter2.print(loggerContext);
+        //statusPrinter2.print(loggerContext);
         assertEquals(Level.ERROR, root.getLevel());
     }
-    
+
     // https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=46697
     @Test
     public void ossFuzz_46697() throws JoranException  {