diff --git a/cmake/external/warpctc.cmake b/cmake/external/warpctc.cmake
index 2e678aadcf91b7ff4c1b396da8ba237c567c7dd3..b3dea19cebd27720c7a63396e96f9e38580a5a47 100644
--- a/cmake/external/warpctc.cmake
+++ b/cmake/external/warpctc.cmake
@@ -33,7 +33,7 @@ ExternalProject_Add(
     UPDATE_COMMAND ""
 )
 
-SET(WARPCTC_INCLUDE_DIR "${WARP_INSTALL_DIR}/include" CACHE PATH "Warp-ctc Directory" FORCE)
+SET(WARPCTC_INCLUDE_DIR "${WARPCTC_INSTALL_DIR}/include" CACHE PATH "Warp-ctc Directory" FORCE)
 INCLUDE_DIRECTORIES(${WARPCTC_INCLUDE_DIR})
 
 IF(WIN32)