diff --git a/src/nvtt/CMakeLists.txt b/src/nvtt/CMakeLists.txt
index cd6cc92..9ce93d0 100644
--- a/src/nvtt/CMakeLists.txt
+++ b/src/nvtt/CMakeLists.txt
@@ -43,7 +43,8 @@ INCLUDE_DIRECTORIES(${CMAKE_CURRENT_SOURCE_DIR})
 
 ADD_DEFINITIONS(-DNVTT_EXPORTS)
 
-IF(NVTT_SHARED)	
+IF(NVTT_SHARED)
+	ADD_DEFINITIONS(-DNVTT_SHARED=1)
 	ADD_LIBRARY(nvtt SHARED ${NVTT_SRCS})
 ELSE(NVTT_SHARED)
 	ADD_LIBRARY(nvtt ${NVTT_SRCS})