diff --git a/configure b/configure
index bddc05b850..34c2adb4a4 100755
--- a/configure
+++ b/configure
@@ -6094,7 +6094,7 @@ fi
 if enabled cuda_nvcc; then
     nvccflags="$nvccflags -ptx"
 else
-    nvccflags="$nvccflags -S -nocudalib -nocudainc --cuda-device-only -include${source_link}/compat/cuda/cuda_runtime.h"
+    nvccflags="$nvccflags -S -nocudalib -nocudainc --cuda-device-only -include ${source_link}/compat/cuda/cuda_runtime.h"
     check_nvcc cuda_llvm
 fi