diff --git a/src/gmtool.c b/src/gmtool.c
index c0d72895d..7008c1136 100644
--- a/src/gmtool.c
+++ b/src/gmtool.c
@@ -1108,7 +1108,7 @@ static void handlekey(state * st, int c)
           strcpy(kbuffer, "getch:");
         }
         sprintf(sbuffer, " 0x%x", c);
-        strncat(kbuffer, sbuffer, sizeof(kbuffer));
+        strncat(kbuffer, sbuffer, sizeof(kbuffer)-1);
         statusline(st->wnd_status->handle, kbuffer);
         if (strlen(kbuffer) > 70)
           kbuffer[0] = 0;
diff --git a/src/kernel/config.c b/src/kernel/config.c
index 02f0a0dde..7bffa0bbf 100644
--- a/src/kernel/config.c
+++ b/src/kernel/config.c
@@ -572,7 +572,7 @@ void verify_data(void)
     int mage, alchemist;
 
     if (verbosity >= 1)
-        puts(" - Überprüfe Daten auf Korrektheit...");
+        puts(" - checking data for correctness...");
 
     for (f = factions; f; f = f->next) {
         mage = 0;
@@ -960,7 +960,7 @@ const char *strcheck(const char *s, size_t maxlen)
     static char buffer[16 * 1024]; // FIXME: static return value
     if (strlen(s) > maxlen) {
         assert(maxlen < 16 * 1024);
-        log_warning("[strcheck] String wurde auf %d Zeichen verkürzt:\n%s\n", (int)maxlen, s);
+        log_warning("[strcheck] string was shortened to %d bytes:\n%s\n", (int)maxlen, s);
         strlcpy(buffer, s, maxlen);
         return buffer;
     }
diff --git a/src/kernel/jsonconf.c b/src/kernel/jsonconf.c
index 3557992b9..d8a0e59e6 100644
--- a/src/kernel/jsonconf.c
+++ b/src/kernel/jsonconf.c
@@ -496,7 +496,7 @@ static void json_strings(cJSON *json) {
         return;
     }
     for (child=json->child;child;child=child->next) {
-        if ((child->type==cJSON_Object)) {
+        if (child->type==cJSON_Object) {
             struct locale *lang = get_or_create_locale(child->string); 
             json_locale(child, lang);
         } else {
@@ -558,7 +558,7 @@ static void json_skill(cJSON *json, struct locale *lang) {
                 cJSON *entry;
                 for (entry=child->child;entry;entry=entry->next) {
                     init_skill(lang, sk, entry->valuestring);
-                    if ((entry==child->child)) {
+                    if (entry==child->child) {
                         locale_setstring(lang, mkname("skill", skillnames[sk]), entry->valuestring); 
                     }
                 }
@@ -588,7 +588,7 @@ static void json_keyword(cJSON *json, struct locale *lang) {
                 cJSON *entry;
                 for (entry=child->child;entry;entry=entry->next) {
                     init_keyword(lang, kwd, entry->valuestring);
-                    if ((entry==child->child)) {
+                    if (entry==child->child) {
                         locale_setstring(lang, mkname("keyword", keywords[kwd]), entry->valuestring); 
                     }
                 }
diff --git a/src/kernel/messages.c b/src/kernel/messages.c
index 086ec2134..654916971 100644
--- a/src/kernel/messages.c
+++ b/src/kernel/messages.c
@@ -208,7 +208,7 @@ caddmessage(region * r, faction * f, const char *s, msg_t mtype, int level)
       m = add_message(&f->msgs, msg_message("msg_economy", "string", s));
       break;
     case MSG_BATTLE:
-      assert(0 || !"battle-meldungen nicht über addmessage machen");
+      assert(0 || !"battle messages must not use addmessage");
       break;
     case MSG_MOVE:
       assert(f);
@@ -240,7 +240,7 @@ caddmessage(region * r, faction * f, const char *s, msg_t mtype, int level)
       }
       break;
     default:
-      assert(!"Ungültige Msg-Klasse!");
+      assert(!"invalid message class");
   }
   if (m)
     msg_release(m);
diff --git a/src/move.c b/src/move.c
index 32d325304..2505b6449 100644
--- a/src/move.c
+++ b/src/move.c
@@ -917,7 +917,7 @@ static unit *bewegung_blockiert_von(unit * reisender, region * r)
             if ((u->faction == reisender->faction) || (ucontact(u, reisender)) || (alliedunit(u, reisender->faction, HELP_GUARD)))
                 guard_count = guard_count - u->number;
             else if (sk >= stealth) {
-                guard_count =+ u->number;
+                guard_count += u->number;
                 double prob_u = (sk - stealth) * skill_prob;
                 /* amulet counts at most once */
                 prob_u += _min (1, _min(u->number, i_get(u->items, ramulet->itype))) * amulet_prob;
diff --git a/src/spy.c b/src/spy.c
index 2320e7cb8..4648b529b 100644
--- a/src/spy.c
+++ b/src/spy.c
@@ -93,13 +93,13 @@ void spy_message(int spy, const unit * u, const unit * target)
         if (first == 1) {
           first = 0;
         } else {
-          strncat(buf, ", ", sizeof(buf));
+          strncat(buf, ", ", sizeof(buf)-1);
         }
         strncat(buf, (const char *)skillname((skill_t)sv->id, u->faction->locale),
-          sizeof(buf));
-        strncat(buf, " ", sizeof(buf));
+          sizeof(buf)-1);
+        strncat(buf, " ", sizeof(buf)-1);
         strncat(buf, itoa10(eff_skill(target, (skill_t)sv->id, target->region)),
-          sizeof(buf));
+          sizeof(buf)-1);
       }
     }
     if (found) {