diff --git a/WHATSNEW b/WHATSNEW
index 7c65633a7..6ed7b150e 100644
--- a/WHATSNEW
+++ b/WHATSNEW
@@ -32,6 +32,10 @@ Fixed bugs:
    directory of the given jarfile.
    Bugzilla Report 55049
 
+ * <concat>'s fixlastline="true" didn't work when using certain filter
+   readers.
+   Bugzilla Report 54672
+
 Other changes:
 --------------
 
diff --git a/src/main/org/apache/tools/ant/taskdefs/Concat.java b/src/main/org/apache/tools/ant/taskdefs/Concat.java
index 6ff9b058d..45716f306 100644
--- a/src/main/org/apache/tools/ant/taskdefs/Concat.java
+++ b/src/main/org/apache/tools/ant/taskdefs/Concat.java
@@ -255,12 +255,12 @@ public class Concat extends Task implements ResourceCollection {
          */
         public int read() throws IOException {
             if (needAddSeparator) {
-                int ret = eolString.charAt(lastPos++);
                 if (lastPos >= eolString.length()) {
                     lastPos = 0;
                     needAddSeparator = false;
+                } else {
+                    return eolString.charAt(lastPos++);
                 }
-                return ret;
             }
             while (getReader() != null) {
                 int ch = getReader().read();
@@ -268,7 +268,8 @@ public class Concat extends Task implements ResourceCollection {
                     nextReader();
                     if (isFixLastLine() && isMissingEndOfLine()) {
                         needAddSeparator = true;
-                        lastPos = 0;
+                        lastPos = 1;
+                        return eolString.charAt(0);
                     }
                 } else {
                     addLastChar((char) ch);
diff --git a/src/tests/antunit/taskdefs/concat-test.xml b/src/tests/antunit/taskdefs/concat-test.xml
index 33243ef02..4b285e389 100644
--- a/src/tests/antunit/taskdefs/concat-test.xml
+++ b/src/tests/antunit/taskdefs/concat-test.xml
@@ -76,6 +76,48 @@
     </au:assertTrue>
   </target>
 
+  <target name="-fixlastline-setup">
+    <mkdir dir="${input}"/>
+    <mkdir dir="${output}"/>
+    <echo file="${input}/1">1</echo>
+    <echo file="${input}/2">2</echo>
+  </target>
+
+  <target name="testFixLastLineActuallyFixes" depends="-fixlastline-setup">
+    <au:assertTrue>
+      <resourcesmatch>
+        <string>1${line.separator}2${line.separator}</string>
+        <concat fixlastline="true">
+          <filelist dir="${input}">
+            <file name="1"/>
+            <file name="2"/>
+          </filelist>
+        </concat>
+      </resourcesmatch>
+    </au:assertTrue>
+  </target>
+
+  <target name="testFixLastLineActuallyFixesWithFilterChain"
+          depends="-fixlastline-setup"
+          description="https://issues.apache.org/bugzilla/show_bug.cgi?id=54672">
+    <au:assertTrue>
+      <resourcesmatch>
+        <string>1${line.separator}2${line.separator}</string>
+        <concat fixlastline="true">
+          <filelist dir="${input}">
+            <file name="1"/>
+            <file name="2"/>
+          </filelist>
+          <filterchain>
+	    <tokenfilter>
+	      <ignoreblank/>
+	    </tokenfilter>
+	  </filterchain>
+        </concat>
+      </resourcesmatch>
+    </au:assertTrue>
+  </target>
+
   <target name="testIgnoreEmptyFalseFileIsCreated">
     <mkdir dir="${input}" />
     <mkdir dir="${output}" />