diff --git a/reactos/lib/3rdparty/bzip2/bzip2.rbuild b/reactos/lib/3rdparty/bzip2/bzip2.rbuild
index f161228aa47..f58e45dee12 100644
--- a/reactos/lib/3rdparty/bzip2/bzip2.rbuild
+++ b/reactos/lib/3rdparty/bzip2/bzip2.rbuild
@@ -1,11 +1,10 @@
 <?xml version="1.0"?>
 <!DOCTYPE module SYSTEM "../../../tools/rbuild/project.dtd">
 <module name="bzip2" type="kernelmodedll" installbase="system32/drivers" installname="unbzip2.dll">
-	<importlibrary definition="unbzip2.def" />
+	<importlibrary definition="unbzip2.spec" />
 	<define name="BZ_NO_STDIO" />
 	<define name="BZ_DECOMPRESS_ONLY" />
 	<library>ntoskrnl</library>
-	<library>hal</library>
 	<file>bzlib.c</file>
 	<file>randtable.c</file>
 	<file>crctable.c</file>
diff --git a/reactos/lib/3rdparty/bzip2/unbzip2.def b/reactos/lib/3rdparty/bzip2/unbzip2.def
deleted file mode 100644
index 181a120518a..00000000000
--- a/reactos/lib/3rdparty/bzip2/unbzip2.def
+++ /dev/null
@@ -1,4 +0,0 @@
-LIBRARY unbzip2.dll
-
-EXPORTS
-BZ2_bzBuffToBuffDecompress@24
diff --git a/reactos/lib/3rdparty/bzip2/unbzip2.spec b/reactos/lib/3rdparty/bzip2/unbzip2.spec
new file mode 100644
index 00000000000..68d5d870a4b
--- /dev/null
+++ b/reactos/lib/3rdparty/bzip2/unbzip2.spec
@@ -0,0 +1 @@
+ @ stdcall BZ2_bzBuffToBuffDecompress(str ptr str long long long)