diff --git a/include/multivector.h b/include/multivector.h
index 09ebb3b732..c619d76ffa 100644
--- a/include/multivector.h
+++ b/include/multivector.h
@@ -51,9 +51,9 @@ public:
      */
     static constexpr int UNDEFINED_TYPE = 0;
     static_assert( FIRST_TYPE_VAL > UNDEFINED_TYPE,
-                   "FIRST_TYPE_VAL has to be greater than UNDEFINED_TYPE" );
+                   "FIRST_TYPE_VAL must be greater than UNDEFINED_TYPE" );
     static_assert( FIRST_TYPE_VAL < LAST_TYPE_VAL,
-                   "FIRST_TYPE_VAL has to be greater than LAST_TYPE_VAL" );
+                   "FIRST_TYPE_VAL must be greater than LAST_TYPE_VAL" );
 
     /**
     * Helper for defining a list of library draw object pointers.
diff --git a/pcbnew/dialogs/dialog_track_via_size.cpp b/pcbnew/dialogs/dialog_track_via_size.cpp
index f71991dc1d..ae25b78cb4 100644
--- a/pcbnew/dialogs/dialog_track_via_size.cpp
+++ b/pcbnew/dialogs/dialog_track_via_size.cpp
@@ -55,7 +55,7 @@ bool DIALOG_TRACK_VIA_SIZE::TransferDataFromWindow()
 
     if( m_viaDrill.GetValue() >= m_viaDiameter.GetValue() )
     {
-        DisplayError( GetParent(), _( "Via drill size has to be smaller than via diameter" ) );
+        DisplayError( GetParent(), _( "Via drill size must be smaller than via diameter" ) );
         m_viaDrillText->SetFocus();
         return false;
     }
diff --git a/pcbnew/import_gfx/graphics_importer.cpp b/pcbnew/import_gfx/graphics_importer.cpp
index fa82a6ee00..6192df1f2e 100644
--- a/pcbnew/import_gfx/graphics_importer.cpp
+++ b/pcbnew/import_gfx/graphics_importer.cpp
@@ -42,7 +42,7 @@ bool GRAPHICS_IMPORTER::Load( const wxString &aFileName )
 
     if( !m_plugin )
     {
-        wxASSERT_MSG( false, "Plugin has to be set before load." );
+        wxASSERT_MSG( false, "Plugin must be set before load." );
         return false;
     }
 
@@ -55,7 +55,7 @@ bool GRAPHICS_IMPORTER::Import( double aScale )
 {
     if( !m_plugin )
     {
-        wxASSERT_MSG( false, "Plugin has to be set before import." );
+        wxASSERT_MSG( false, "Plugin must be set before import." );
         return false;
     }
 
diff --git a/pcbnew/router/router_tool.cpp b/pcbnew/router/router_tool.cpp
index d54dad0691..90313a2cdd 100644
--- a/pcbnew/router/router_tool.cpp
+++ b/pcbnew/router/router_tool.cpp
@@ -785,7 +785,7 @@ int ROUTER_TOOL::handleLayerSwitch( const TOOL_EVENT& aEvent, bool aForceVia )
             infobar->RemoveAllButtons();
             infobar->AddButton( button );
 
-            infobar->ShowMessageFor( _( "Blind/buried vias have to be enabled in "
+            infobar->ShowMessageFor( _( "Blind/buried vias must first be enabled in "
                                         "Board Setup > Design Rules > Constraints." ),
                                      10000, wxICON_ERROR );
             return false;
@@ -806,7 +806,7 @@ int ROUTER_TOOL::handleLayerSwitch( const TOOL_EVENT& aEvent, bool aForceVia )
             infobar->RemoveAllButtons();
             infobar->AddButton( button );
 
-            infobar->ShowMessageFor( _( "Microvias have to be enabled in "
+            infobar->ShowMessageFor( _( "Microvias must first be enabled in "
                                         "Board Setup > Design Rules > Constraints." ),
                                      10000, wxICON_ERROR );
             return false;