Index: trunk/psModules/src/imcombine/pmSubtraction.c
===================================================================
--- trunk/psModules/src/imcombine/pmSubtraction.c	(revision 21428)
+++ trunk/psModules/src/imcombine/pmSubtraction.c	(revision 21429)
@@ -1087,6 +1087,6 @@
     const psRegion *region = args->data[15]; // Region to convolve
     const pmSubtractionKernels *kernels = args->data[16]; // Kernels
-    bool doBG = PS_SCALAR_VALUE(args->data[17], PS_TYPE_U8); // Do background subtraction?
-    bool useFFT = PS_SCALAR_VALUE(args->data[18], PS_TYPE_U8); // Use FFT for convolution?
+    bool doBG = PS_SCALAR_VALUE(args->data[17], U8); // Do background subtraction?
+    bool useFFT = PS_SCALAR_VALUE(args->data[18], U8); // Use FFT for convolution?
 
     return subtractionConvolvePatch(numCols, numRows, x0, y0, out1, out2, convMask, ro1, ro2, sys1, sys2,