Index: trunk/psLib/src/fits/psFitsHeader.c
===================================================================
--- trunk/psLib/src/fits/psFitsHeader.c	(revision 22432)
+++ trunk/psLib/src/fits/psFitsHeader.c	(revision 22729)
@@ -149,5 +149,5 @@
 
 
-bool psFitsCheckSingleCompressedImagePHU(const psFits *fits, psMetadata *header)
+bool psFitsCheckCompressedImagePHU(const psFits *fits, psMetadata *header)
 {
     PS_ASSERT_FITS_NON_NULL(fits, false);
@@ -163,6 +163,6 @@
     }
 
-    if (psFitsGetSize(fits) != 2) {
-        // No second extension, or multiple extensions
+    if (psFitsGetSize(fits) == 1) {
+        // No extension present
         return false;
     }
@@ -416,5 +416,5 @@
     // Explore the potential case that this is an empty PHU, and the first extension contains the sole image,
     // which is compressed.
-    if (psFitsCheckSingleCompressedImagePHU(fits, header)) {
+    if (psFitsCheckCompressedImagePHU(fits, header)) {
         // This is really what we want, not the empty PHU
         psTrace("psLib.fits", 1,