diff --git a/libqpdf/QPDFJob.cc b/libqpdf/QPDFJob.cc
index bc47e34..5d7d26e 100644
--- a/libqpdf/QPDFJob.cc
+++ b/libqpdf/QPDFJob.cc
@@ -123,7 +123,7 @@ ImageOptimizer::ImageOptimizer(
         // Recompress existing jpeg.
         decode_level = qpdf_dl_all;
         config = Pl_DCT::make_compress_config(
-            [quality](jpeg_compress_struct* cinfo) { jpeg_set_quality(cinfo, quality, false); });
+            [quality](jpeg_compress_struct* cinfo) { jpeg_set_quality(cinfo, quality, FALSE); });
     }
 }
 
diff --git a/manual/release-notes.rst b/manual/release-notes.rst
index b7f87d3..3ed772d 100644
--- a/manual/release-notes.rst
+++ b/manual/release-notes.rst
@@ -46,6 +46,10 @@ more detail.
 
     - Fix Android build issues.
 
+    - Fix incorrect use of jpeg library introduced with the
+      ``--jpeg-quality`` feature introduced in 12.1.0. This was
+      causing build failures on some platforms.
+
   - Other enhancements
 
     - More sanity checks have been added when files with damaged xref tables