diff --git a/src/ctbutterfly/ctbutterfly.cpp b/src/ctbutterfly/ctbutterfly.cpp
index 8085375..96ab1ae 100644
--- a/src/ctbutterfly/ctbutterfly.cpp
+++ b/src/ctbutterfly/ctbutterfly.cpp
@@ -763,10 +763,6 @@ void ctbutterfly::eigenvectors(const double& a,
     *lambda2    = arg1 - arg2;
 
     // Compute eigenvectors
-    double vector1_1;
-    double vector1_2;
-    double vector2_1;
-    double vector2_2;
     if (c != 0.0) {
         (*vector1)[0] = *lambda1 - det;
         (*vector1)[1] = c;
diff --git a/src/ctlike/ctlike.cpp b/src/ctlike/ctlike.cpp
index d34e80f..a78b167 100644
--- a/src/ctlike/ctlike.cpp
+++ b/src/ctlike/ctlike.cpp
@@ -256,7 +256,7 @@ void ctlike::run(void)
     }
 
     // Compute TS values if requested
-    if (ts_srcs.size() > 0) {
+    if (!ts_srcs.empty()) {
 
         // Store original maximum likelihood and models
         double  logL_src = m_logL;
diff --git a/src/ctselect/ctselect.cpp b/src/ctselect/ctselect.cpp
index 0ef39d3..706116d 100644
--- a/src/ctselect/ctselect.cpp
+++ b/src/ctselect/ctselect.cpp
@@ -1107,7 +1107,7 @@ std::string ctselect::check_infile(const std::string& filename) const
         }
 
         // Set error message for missing columns
-        if (missing.size() > 0) {
+        if (!missing.empty()) {
             message = "The following columns are missing in the"
                       " \"EVENTS\" extension of input file \""
                     + m_outobs + "\": ";