diff --git a/src/ctlike/ctlike.cpp b/src/ctlike/ctlike.cpp
index 1dd4f39..7f24def 100644
--- a/src/ctlike/ctlike.cpp
+++ b/src/ctlike/ctlike.cpp
@@ -241,6 +241,18 @@ void ctlike::run(void)
         log << std::endl;
     }
 
+    // Set energy dispersion flag for all CTA observations and save old
+    // values in save_edisp vector
+    std::vector<bool> save_edisp;
+    save_edisp.assign(m_obs.size(), false);
+    for (int i = 0; i < m_obs.size(); ++i) {
+        GCTAObservation* obs = dynamic_cast<GCTAObservation*>(m_obs[i]);
+        if (obs != NULL) {
+            save_edisp[i] = obs->response().apply_edisp();
+            obs->response().apply_edisp(m_apply_edisp);
+        }
+    }
+
     // Write observation(s) into logger
     if (logTerse()) {
         log << std::endl;
@@ -275,6 +287,14 @@ void ctlike::run(void)
         log << m_obs.models() << std::endl;
     }
 
+    // Restore energy dispersion flag for all CTA observations
+    for (int i = 0; i < m_obs.size(); ++i) {
+        GCTAObservation* obs = dynamic_cast<GCTAObservation*>(m_obs[i]);
+        if (obs != NULL) {
+            obs->response().apply_edisp(save_edisp[i]);
+        }
+    }
+
     // Return
     return;
 }
@@ -403,8 +423,9 @@ void ctlike::get_parameters(void)
 
     } // endif: no models were associated with observations
 
-    // Get standard parameters
-    m_refit  = (*this)["refit"].boolean();
+    // Get other parameters
+    m_refit       = (*this)["refit"].boolean();
+    m_apply_edisp = (*this)["edisp"].boolean();
 
     // Optionally read ahead parameters so that they get correctly
     // dumped into the log file
@@ -486,12 +507,13 @@ void ctlike::init_members(void)
     m_irf.clear();
     m_outmdl.clear();
     m_obs.clear();
-    m_refit      = false;
-    m_max_iter   = 100;   // Set maximum number of iterations
-    m_max_stall  = 10;    // Set maximum number of stalls
-    m_logL       = 0.0;
-    m_opt        = NULL;
-    m_read_ahead = false;
+    m_refit       = false;
+    m_max_iter    = 100;   // Set maximum number of iterations
+    m_max_stall   = 10;    // Set maximum number of stalls
+    m_logL        = 0.0;
+    m_opt         = NULL;
+    m_read_ahead  = false;
+    m_apply_edisp = false;
 
     // Set logger properties
     log.date(true);
@@ -509,17 +531,18 @@ void ctlike::init_members(void)
 void ctlike::copy_members(const ctlike& app)
 {
     // Copy attributes
-    m_stat       = app.m_stat;
-    m_refit      = app.m_refit;
-    m_caldb      = app.m_caldb;
-    m_irf        = app.m_irf;
-    m_outmdl     = app.m_outmdl;
-    m_obs        = app.m_obs;
-    m_max_iter   = app.m_max_iter;
-    m_max_stall  = app.m_max_stall;
-    m_logL       = app.m_logL;
-    m_opt        = app.m_opt->clone();
-    m_read_ahead = app.m_read_ahead;
+    m_stat        = app.m_stat;
+    m_refit       = app.m_refit;
+    m_caldb       = app.m_caldb;
+    m_irf         = app.m_irf;
+    m_outmdl      = app.m_outmdl;
+    m_obs         = app.m_obs;
+    m_max_iter    = app.m_max_iter;
+    m_max_stall   = app.m_max_stall;
+    m_logL        = app.m_logL;
+    m_opt         = app.m_opt->clone();
+    m_read_ahead  = app.m_read_ahead;
+    m_apply_edisp = app.m_apply_edisp;
 
     // Return
     return;
diff --git a/src/ctlike/ctlike.hpp b/src/ctlike/ctlike.hpp
index 86bcdf1..a53781e 100644
--- a/src/ctlike/ctlike.hpp
+++ b/src/ctlike/ctlike.hpp
@@ -71,11 +71,12 @@ protected:
     void free_members(void);
 
     // User parameters
-    std::string   m_stat;       //!< Optimisation statistics (poisson/gaussian)
-    bool          m_refit;      //!< Refitting
-    std::string   m_caldb;      //!< Calibration database
-    std::string   m_irf;        //!< Instrument response functions
-    std::string   m_outmdl;     //!< Source model output XML file
+    std::string   m_stat;        //!< Optimisation statistics (poisson/gaussian)
+    bool          m_refit;       //!< Refitting
+    std::string   m_caldb;       //!< Calibration database
+    std::string   m_irf;         //!< Instrument response functions
+    std::string   m_outmdl;      //!< Source model output XML file
+    bool          m_apply_edisp; //!< Apply energy dispersion?
 
     // Members
     GObservations m_obs;        //!< Observations
diff --git a/src/ctlike/ctlike.par b/src/ctlike/ctlike.par
index 89d205f..85d939b 100644
--- a/src/ctlike/ctlike.par
+++ b/src/ctlike/ctlike.par
@@ -17,13 +17,14 @@
 #
 # General parameters
 #===================
-infile, f, a, "test/data/crab_events.fits.gz",,,"Event list, counts map or observation definition file"
-stat,   s, h, "POISSON",,,            "Optimization statistics"
-refit,  b, h,        no,,,            "Do refitting?"
-caldb,  s, a,         "",,,           "Calibration database"
-irf,    s, a, "cta_dummy_irf",,,      "Instrument response function"
-srcmdl, f, a, "test/data/crab.xml",,, "Source model"
-outmdl, f, a, "crab_results.xml",,,   "Source model output file"
+infile, f, a, "events.fits",,,"Event list, counts map or observation definition file"
+stat,   s, h, "POISSON",,, "Optimization statistics"
+refit,  b, h, no,,, "Do refitting?"
+edisp,  b, h, no,,, "Apply energy dispersion?"
+caldb,  s, a, "$CTOOLS/share/caldb/data/cta/dummy",,, "Calibration database"
+irf,    s, a, "cta_dummy_irf",,, "Instrument response function"
+srcmdl, f, a, "$CTOOLS/share/models/crab.xml",,, "Source model"
+outmdl, f, a, "crab_results.xml",,, "Source model output file"
 #
 # Standard parameters
 #====================