--- a/data/kernels/CMakeLists.txt	2020-04-15 09:10:53.000000000 +0200
+++ b/data/kernels/CMakeLists.txt	2020-04-21 14:12:35.546222704 +0200
@@ -31,8 +31,8 @@
 endmacro (testcompile_opencl_kernel)
 
 if (TESTBUILD_OPENCL_PROGRAMS)
-  foreach(IN ${DT_OPENCL_KERNELS})
-    testcompile_opencl_kernel(${IN})
+  foreach(KERNEL IN ITEMS ${DT_OPENCL_KERNELS})
+    testcompile_opencl_kernel(${KERNEL})
   endforeach()
 endif()