diff --git a/cmake/Modules/FindIFEMDeps.cmake b/cmake/Modules/FindIFEMDeps.cmake
index c459819d..95e7b5f1 100644
--- a/cmake/Modules/FindIFEMDeps.cmake
+++ b/cmake/Modules/FindIFEMDeps.cmake
@@ -122,6 +122,7 @@ IF(IFEM_USE_LRSPLINES)
       SET(IFEM_DEPLIBS ${IFEM_DEPLIBS} ${LRSpline_LIBRARIES})
       SET(IFEM_DEPINCLUDES ${IFEM_DEPINCLUDES} ${LRSpline_INCLUDE_DIRS})
       SET(IFEM_BUILD_CXX_FLAGS "${IFEM_BUILD_CXX_FLAGS} -DHAS_LRSPLINE=1 ${LRSpline_DEFINITIONS}")
+      SET(IFEM_CXX_FLAGS "${IFEM_CXX_FLAGS} -DHAS_LRSPLINE=1 ${LRSpline_DEFINITIONS}")
     ENDIF(LRSPLINE_VERSION_MINOR LESS 4)
   ENDIF(LRSpline_LIBRARIES AND LRSpline_INCLUDE_DIRS)
 ENDIF(IFEM_USE_LRSPLINES)