diff --git a/components/powerpdf/PdfDoc.pas b/components/powerpdf/PdfDoc.pas
index 32034f5b9..7a8a6b803 100644
--- a/components/powerpdf/PdfDoc.pas
+++ b/components/powerpdf/PdfDoc.pas
@@ -47,7 +47,7 @@ interface
 
 // if use "FlateDecode" compression, comment out the next line.
 // (this unit and PdfTypes.pas)
-{$DEFINE NOZLIB}
+//{$DEFINE NOZLIB}
 
 uses
   SysUtils, Classes, PdfTypes
diff --git a/components/powerpdf/PdfTypes.pas b/components/powerpdf/PdfTypes.pas
index c0b8b48ff..1e5f0d021 100644
--- a/components/powerpdf/PdfTypes.pas
+++ b/components/powerpdf/PdfTypes.pas
@@ -34,7 +34,7 @@ interface
 
 // if use "FlateDecode" compression, comment out the next line.
 // (this unit and PdfDoc.pas)
-{$DEFINE NOZLIB}
+//{$DEFINE NOZLIB}
 
 uses
   SysUtils, Classes
@@ -42,6 +42,7 @@ uses
   , Windows
 {$ENDIF}
 {$IFNDEF NOZLIB}
+  ,ZStream
   ,Zlib;
 {$ELSE}
   ;