diff --git a/CMakeLists.txt b/CMakeLists.txt
index fb65fea65..a7a0219d9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -435,6 +435,11 @@ IF(UNIX AND NOT WIN32 AND NOT APPLE)
   ENDIF(CMAKE_BUILD_TYPE STREQUAL "Debug")
 ENDIF(UNIX AND NOT WIN32 AND NOT APPLE)
 
+IF(CYGWIN)
+  IF(CMAKE_BUILD_TYPE STREQUAL "Debug")
+    ADD_DEFINITIONS("-D_DEBUG")
+  ENDIF(CMAKE_BUILD_TYPE STREQUAL "Debug")
+ENDIF(CYGWIN)
 
 IF(UNIX AND NOT WIN32 AND NOT APPLE)
   IF(CMAKE_SIZEOF_VOID_P MATCHES "8")
diff --git a/src/osgDB/Registry.cpp b/src/osgDB/Registry.cpp
index 56a6dc23b..62d3ac393 100644
--- a/src/osgDB/Registry.cpp
+++ b/src/osgDB/Registry.cpp
@@ -622,7 +622,11 @@ std::string Registry::createLibraryNameForExtension(const std::string& ext)
 #endif
 
 #if defined(__CYGWIN__)
-    return prepend+"cygwin_"+"osgdb_"+lowercase_ext+".dll";
+    #ifdef _DEBUG
+        return prepend+"cygwin_"+"osgdb_"+lowercase_ext+OSG_DEBUG_POSTFIX+".dll";
+    #else
+        return prepend+"cygwin_"+"osgdb_"+lowercase_ext+".dll";
+    #endif
 #elif defined(__MINGW32__)
     return prepend+"mingw_"+"osgdb_"+lowercase_ext+".dll";
 #elif defined(WIN32)