diff --git a/src/CLI2.cpp b/src/CLI2.cpp
index c28138359..3f8e3853c 100644
--- a/src/CLI2.cpp
+++ b/src/CLI2.cpp
@@ -231,7 +231,7 @@ bool CLI2::getOverride (int argc, const char** argv, std::string& home, File& rc
   if (value == nullptr)
     return false;
   rc = File (value);
-  if (rc._data.rfind ('/') != std::string::npos)
+  if (rc._data.rfind ("/") != std::string::npos)
     home = rc.parent ();
   else
     home = ".";
@@ -1483,7 +1483,7 @@ void CLI2::findIDs ()
           for (auto& element : elements)
           {
             changes = true;
-            auto hyphen = element.find ('-');
+            auto hyphen = element.find ("-");
             if (hyphen != std::string::npos)
               _id_ranges.emplace_back(element.substr (0, hyphen), element.substr (hyphen + 1));
             else
@@ -1538,7 +1538,7 @@ void CLI2::findIDs ()
             for (const auto& element : elements)
             {
               changes = true;
-              auto hyphen = element.find ('-');
+              auto hyphen = element.find ("-");
               if (hyphen != std::string::npos)
                 _id_ranges.emplace_back(element.substr (0, hyphen), element.substr (hyphen + 1));
               else
diff --git a/src/Lexer.cpp b/src/Lexer.cpp
index 31bd263f1..ad5e42eca 100644
--- a/src/Lexer.cpp
+++ b/src/Lexer.cpp
@@ -1671,7 +1671,7 @@ bool Lexer::decomposeSubstitution (
     if (readWord (text, "/", cursor, parsed_to))
     {
       std::string parsed_flags = text.substr (cursor);
-      if (parsed_flags.find ('/') == std::string::npos)
+      if (parsed_flags.find ("/") == std::string::npos)
       {
         dequote (parsed_from, "/");
         dequote (parsed_to,   "/");
@@ -1700,7 +1700,7 @@ bool Lexer::decomposePattern (
       ignored.length ())
   {
     auto parsed_flags = text.substr (cursor);
-    if (parsed_flags.find ('/') == std::string::npos)
+    if (parsed_flags.find ("/") == std::string::npos)
     {
       flags   = parsed_flags;
       pattern = text.substr (1, cursor - 2 - flags.length ());
diff --git a/src/ViewTask.cpp b/src/ViewTask.cpp
index 68bd253a1..7949fe5a8 100644
--- a/src/ViewTask.cpp
+++ b/src/ViewTask.cpp
@@ -279,7 +279,7 @@ std::string ViewTask::render (std::vector <Task>& data, std::vector <int>& seque
     out += extra;
 
     // Trim right.
-    out.erase (out.find_last_not_of (' ') + 1);
+    out.erase (out.find_last_not_of (" ") + 1);
     out += "\n";
 
     // Stop if the line limit is exceeded.
@@ -365,7 +365,7 @@ std::string ViewTask::render (std::vector <Task>& data, std::vector <int>& seque
       out += (odd ? extra_odd : extra_even);
 
       // Trim right.
-      out.erase (out.find_last_not_of (' ') + 1);
+      out.erase (out.find_last_not_of (" ") + 1);
       out += "\n";
 
       // Stop if the line limit is exceeded.