diff --git a/core/src/main/java/com/google/googlejavaformat/java/StringWrapper.java b/core/src/main/java/com/google/googlejavaformat/java/StringWrapper.java
index c1c38d34..5d10da38 100644
--- a/core/src/main/java/com/google/googlejavaformat/java/StringWrapper.java
+++ b/core/src/main/java/com/google/googlejavaformat/java/StringWrapper.java
@@ -225,7 +225,9 @@ private void indentTextBlocks(
           }
           if (i == lines.size() - 1) {
             String withoutDelimiter =
-                trimmed.substring(0, trimmed.length() - TEXT_BLOCK_DELIMITER.length());
+                trimmed
+                    .substring(0, trimmed.length() - TEXT_BLOCK_DELIMITER.length())
+                    .stripTrailing();
             if (!withoutDelimiter.stripLeading().isEmpty()) {
               output.append(withoutDelimiter).append('\\').append(separator).append(prefix);
             }
diff --git a/core/src/test/resources/com/google/googlejavaformat/java/testdata/I1205.input b/core/src/test/resources/com/google/googlejavaformat/java/testdata/I1205.input
new file mode 100644
index 00000000..8f8acaa1
--- /dev/null
+++ b/core/src/test/resources/com/google/googlejavaformat/java/testdata/I1205.input
@@ -0,0 +1,7 @@
+public interface Foo {
+
+  private static String foo =
+      """
+       foo\
+       bar """;
+}
diff --git a/core/src/test/resources/com/google/googlejavaformat/java/testdata/I1205.output b/core/src/test/resources/com/google/googlejavaformat/java/testdata/I1205.output
new file mode 100644
index 00000000..c82862c0
--- /dev/null
+++ b/core/src/test/resources/com/google/googlejavaformat/java/testdata/I1205.output
@@ -0,0 +1,8 @@
+public interface Foo {
+
+  private static String foo =
+      """
+      foo\
+      bar\
+      """;
+}