diff --git a/src/ctbin/ctbin.cpp b/src/ctbin/ctbin.cpp
index 65d3274..66def29 100644
--- a/src/ctbin/ctbin.cpp
+++ b/src/ctbin/ctbin.cpp
@@ -503,7 +503,7 @@ void ctbin::bin_events(GCTAObservation* obs)
         	// Open fits file to check which extension is given
         	GFits file(m_ebinfile);
 
-        	if (file.hashdu("EBOUNDS")) {
+        	if (file.contains("EBOUNDS")) {
 
         		// Close file and load ebounds
         		file.close();
@@ -511,7 +511,7 @@ void ctbin::bin_events(GCTAObservation* obs)
 
         	} // endif: EBOUNDS extension was given
 
-        	else if (file.hashdu("ENERGYBINS")) {
+        	else if (file.contains("ENERGYBINS")) {
 
         		// Close file and load ebounds
         		file.close();
diff --git a/src/ctlike/ctlike.cpp b/src/ctlike/ctlike.cpp
index 9dbd6a6..5314df0 100644
--- a/src/ctlike/ctlike.cpp
+++ b/src/ctlike/ctlike.cpp
@@ -339,9 +339,9 @@ void ctlike::get_parameters(void)
         try {
 
             // Determine whether FITS file has EVENTS extension
-            GFits file(filename);
-            bool  is_unbinned = file.hashdu("EVENTS");
-            file.close();
+            GFits fits(filename);
+            bool  is_unbinned = fits.contains("EVENTS");
+            fits.close();
 
             // If FITS file has an events header then load as unbinned
             if (is_unbinned) {
diff --git a/src/ctselect/ctselect.cpp b/src/ctselect/ctselect.cpp
index 4247ae1..191cc9e 100644
--- a/src/ctselect/ctselect.cpp
+++ b/src/ctselect/ctselect.cpp
@@ -603,7 +603,7 @@ void ctselect::select_events(GCTAObservation* obs, const std::string& filename)
     }
 
     // Check if we have an EVENTS HDU
-    if (!file.hashdu("EVENTS")) {
+    if (!file.contains("EVENTS")) {
         std::string message = "No \"EVENTS\" extension found in FITS file "+
                               expression+".";
         throw GException::app_error(G_SELECT_EVENTS, message);
@@ -952,7 +952,7 @@ void ctselect::save_event_list(const GCTAObservation* obs,
         GFits infits(infile);
         GFits outfits(outfile);
         for (int extno = 1; extno < infits.size(); ++extno) {
-            GFitsHDU* hdu = infits.hdu(extno);
+            GFitsHDU* hdu = infits.at(extno);
             if (hdu->extname() != "EVENTS" && hdu->extname() != "GTI") {
                 outfits.append(*hdu);
             }