diff --git a/configure.ac b/configure.ac
index 05a0d6a8..635186e6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -901,7 +901,7 @@ AC_ARG_ENABLE([dks], [AS_HELP_STRING([--enable-dks],[build musrfit with DKS (GPU
    if test -x "$cuda_prefix/bin/nvcc"; then
      AC_MSG_RESULT([found])
      AC_DEFINE_UNQUOTED([NVCC_PATH], ["$cuda_prefix/bin/nvcc"], [path to nvcc binary])
-     CUDA_FOUND="true"
+     CUDA_FOUND="yes"
      CUDA_CFLAGS="-I$cuda_prefix/include"
      CXXFLAGS="$CUDA_CFLAGS $CXXFLAGS"
      CUDA_LDFLAGS="-L$cuda_prefix/lib64"