diff --git a/libraries/lzma/CMakeLists.txt b/libraries/lzma/CMakeLists.txt
index bfb8e327e..3ef9184bd 100644
--- a/libraries/lzma/CMakeLists.txt
+++ b/libraries/lzma/CMakeLists.txt
@@ -1,6 +1,6 @@
 make_release_only()
 
-set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -D_7ZIP_PPMD_SUPPPORT" )
+set( CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -DZ7_PPMD_SUPPPORT" )
 
 find_package(Threads)