Index: /trunk/psphot/src/psphotEfficiency.c
===================================================================
--- /trunk/psphot/src/psphotEfficiency.c	(revision 26452)
+++ /trunk/psphot/src/psphotEfficiency.c	(revision 26453)
@@ -128,4 +128,6 @@
     psFree(rng);
 
+    bool oldThreads = pmReadoutFakeThreads(true); // Old threading status
+
     pmReadout *fakeRO = pmReadoutAlloc(NULL); // Fake readout
     if (!pmReadoutFakeFromVectors(fakeRO, numCols, numRows, xAll, yAll, magAll,
@@ -141,4 +143,6 @@
     psFree(xAll);
     psFree(yAll);
+
+    pmReadoutFakeThreads(oldThreads);
 
     psBinaryOp(ro->image, ro->image, "+", fakeRO->image);