Index: trunk/psModules/src/camera/pmReadoutFake.c
===================================================================
--- trunk/psModules/src/camera/pmReadoutFake.c	(revision 19189)
+++ trunk/psModules/src/camera/pmReadoutFake.c	(revision 19211)
@@ -126,5 +126,6 @@
         pmSource *fakeSource = pmSourceAlloc(); // Fake source to generate
         fakeSource->peak = pmPeakAlloc(x, y, fakeModel->params->data.F32[PM_PAR_I0], PM_PEAK_LONE);
-        float fakeRadius = radius > 0 ? radius : fakeModel->modelRadius(fakeModel->params, minFlux); // Radius
+        float fakeRadius = radius > 0 ? radius :
+            PS_MAX(1.0, fakeModel->modelRadius(fakeModel->params, minFlux)); // Radius of fake source
 
         if (xOffset) {