diff --git a/src/grandorgue/help/GOHelpController.h b/src/grandorgue/help/GOHelpController.h
index 71d5674c8..f55eaf69d 100644
--- a/src/grandorgue/help/GOHelpController.h
+++ b/src/grandorgue/help/GOHelpController.h
@@ -4,7 +4,7 @@
 #include <wx/html/helpctrl.h>
 
 /*
- * The standard wxHtmlHelpController can not bring the help above a modal dialog
+ * The standard wxHtmlHelpController cannot bring the help above a modal dialog
  * under linux. This class creates wxHtmlHelpFrame with wxTOPLEVEL_EX_DIALOG
  * extra style for being able to do this.
  */
diff --git a/src/grandorgue/loader/GOObjectDistributor.h b/src/grandorgue/loader/GOObjectDistributor.h
index 3c119781f..a2e657beb 100644
--- a/src/grandorgue/loader/GOObjectDistributor.h
+++ b/src/grandorgue/loader/GOObjectDistributor.h
@@ -56,7 +56,7 @@ template <class T> class GOObjectDistributor {
 
   /**
    * This method is called on any exception occured. It causes that all worker
-   * threads stop working immediate because they can not fetch more objects
+   * threads stop working immediate because they cannot fetch more objects
    */
   void Break() { m_IsBroken.store(true); }
 };
diff --git a/src/grandorgue/sound/GOSoundDefs.h b/src/grandorgue/sound/GOSoundDefs.h
index d0e5ca21c..d73f0ad1c 100644
--- a/src/grandorgue/sound/GOSoundDefs.h
+++ b/src/grandorgue/sound/GOSoundDefs.h
@@ -26,7 +26,7 @@
 /* Maximum number of blocks (1 block is nChannels samples) per frame */
 #define MAX_FRAME_SIZE (1024)
 
-/* Maximum number of channels the engine supports. This value can not be
+/* Maximum number of channels the engine supports. This value cannot be
  * changed at present.
  */
 #define MAX_OUTPUT_CHANNELS (2)
diff --git a/src/grandorgue/sound/ports/GOSoundJackPort.cpp b/src/grandorgue/sound/ports/GOSoundJackPort.cpp
index d1e6e6413..9c1122719 100644
--- a/src/grandorgue/sound/ports/GOSoundJackPort.cpp
+++ b/src/grandorgue/sound/ports/GOSoundJackPort.cpp
@@ -5,7 +5,7 @@
  * (https://www.gnu.org/licenses/old-licenses/gpl-2.0.html).
  */
 
-// wx should be included before windows.h (from jack.h), otherwise it can not be
+// wx should be included before windows.h (from jack.h), otherwise it cannot be
 // compiled with mingw
 #include "GOSoundJackPort.h"