diff --git a/reactos/dll/3rdparty/libjpeg/CMakeLists.txt b/reactos/dll/3rdparty/libjpeg/CMakeLists.txt
index 1356e31a0f0..10ef59a6708 100644
--- a/reactos/dll/3rdparty/libjpeg/CMakeLists.txt
+++ b/reactos/dll/3rdparty/libjpeg/CMakeLists.txt
@@ -3,8 +3,7 @@ add_definitions(
     -DWIN32
     -D_WINDOWS
     -D_MBCS
-    -DJPEG_DLL
-    -Dmain=mainptr)
+    -DJPEG_DLL)
 
 include_directories(
     ${REACTOS_SOURCE_DIR}/include/reactos/libs/libjpeg
@@ -58,7 +57,6 @@ add_library(libjpeg SHARED
     jmemmgr.c
     jmemnobs.c)
 
-set_entrypoint(libjpeg 0)
 add_importlibs(libjpeg msvcrt kernel32)
 add_dependencies(libjpeg psdk)
 add_cd_file(TARGET libjpeg DESTINATION reactos/system32 FOR all)
diff --git a/reactos/dll/3rdparty/libpng/CMakeLists.txt b/reactos/dll/3rdparty/libpng/CMakeLists.txt
index d88ea48af71..00a84dbc5f7 100644
--- a/reactos/dll/3rdparty/libpng/CMakeLists.txt
+++ b/reactos/dll/3rdparty/libpng/CMakeLists.txt
@@ -26,7 +26,6 @@ add_library(libpng SHARED
     pngwtran.c
     pngwutil.c)
 
-set_entrypoint(libpng 0)
 target_link_libraries(libpng zlib)
 add_importlibs(libpng msvcrt kernel32 ntdll)
 add_dependencies(libpng psdk)
diff --git a/reactos/dll/3rdparty/libtiff/CMakeLists.txt b/reactos/dll/3rdparty/libtiff/CMakeLists.txt
index 553ace51be7..e2ba3603584 100644
--- a/reactos/dll/3rdparty/libtiff/CMakeLists.txt
+++ b/reactos/dll/3rdparty/libtiff/CMakeLists.txt
@@ -50,7 +50,7 @@ add_library(libtiff SHARED
     tif_write.c
     tif_zip.c)
 
-set_module_type(libtiff win32dll ENTRYPOINT 0)
+set_module_type(libtiff win32dll)
 target_link_libraries(libtiff zlib getopt)
 add_importlibs(libtiff user32 msvcrt kernel32 ntdll)
 add_dependencies(libtiff psdk)
diff --git a/reactos/dll/3rdparty/libxslt/CMakeLists.txt b/reactos/dll/3rdparty/libxslt/CMakeLists.txt
index 6e0282a2fa5..2ddadd2a382 100644
--- a/reactos/dll/3rdparty/libxslt/CMakeLists.txt
+++ b/reactos/dll/3rdparty/libxslt/CMakeLists.txt
@@ -33,7 +33,7 @@ add_library(libxslt SHARED
     xsltlocale.c
     xsltutils.c)
 
-set_module_type(libxslt win32dll ENTRYPOINT 0)
+set_module_type(libxslt win32dll)
 target_link_libraries(libxslt libxml2)
 add_importlibs(libxslt msvcrt ws2_32 kernel32)