diff --git a/src/frontend/inp.c b/src/frontend/inp.c
index b295e3ed9..4712f221f 100644
--- a/src/frontend/inp.c
+++ b/src/frontend/inp.c
@@ -1234,7 +1234,7 @@ inp_spsource(FILE *fp, bool comfile, char *filename, bool intfile)
             ft_curckt->FTEstats->FTESTATnetPrepTime = seconds() - startTime;
         }
 
-        /* in shared ngspice controls a execute in the primary thread, typically
+        /* in shared ngspice controls are executed in the primary thread, typically
            before the background thread has finished. This leads to premature execution
            of commands. Thus this is delegated to a function using a third thread, that
            only starts when the background thread has finished (sharedspice.c).*/
diff --git a/src/sharedspice.c b/src/sharedspice.c
index 101c9924e..a2494785c 100644
--- a/src/sharedspice.c
+++ b/src/sharedspice.c
@@ -593,7 +593,7 @@ sighandler_sharedspice(int num)
 #endif /*THREADS*/
 
 /* create a suspended thread tid2 that is activated when bg_run has finished.
-   It executes the .control commands. If the arguemnt is NULL, the thread is
+   It executes the .control commands. If the argument is NULL, the thread is
    started with the existing controls (e.g. during command 'reset'. */
 void
 exec_controls(wordlist *newcontrols)