diff --git a/src/files.c b/src/files.c
index 444ad6503..f40385d4b 100644
--- a/src/files.c
+++ b/src/files.c
@@ -4640,7 +4640,7 @@ reveal_paths(int code)
     if (code == 1) {
         raw_printf("NOTE: The %s above is missing or inaccessible!",
                    SYSCONFFILE);
-	skip_sysopt = TRUE;
+        skip_sysopt = TRUE;
     }
 #else /* !SYSCF */
     raw_printf("No system configuration file.");
@@ -4722,8 +4722,8 @@ reveal_paths(int code)
 #ifdef SYSCF
     if (!skip_sysopt) {
         fqn = sysopt.dumplogfile;
-	if (!fqn)
-	    nodumpreason = "DUMPLOGFILE is not set in " SYSCONFFILE;
+        if (!fqn)
+            nodumpreason = "DUMPLOGFILE is not set in " SYSCONFFILE;
     } else {
         nodumpreason = SYSCONFFILE " is missing; no DUMPLOGFILE setting";
     }
diff --git a/src/pray.c b/src/pray.c
index ba700c4dd..066042af0 100644
--- a/src/pray.c
+++ b/src/pray.c
@@ -1144,7 +1144,7 @@ pleased(aligntyp g_align)
             fix_worst_trouble(trouble);
             FALLTHROUGH;
             /*FALLTHRU*/
-	    case 2:
+        case 2:
             /* up to 9 troubles */
             while ((trouble = in_trouble()) > 0 && (++tryct < 10))
                 fix_worst_trouble(trouble);
diff --git a/src/sounds.c b/src/sounds.c
index ec5d2aae2..599469de8 100644
--- a/src/sounds.c
+++ b/src/sounds.c
@@ -1142,7 +1142,7 @@ domonnoise(struct monst *mtmp)
             (void) demon_talk(mtmp);
             break;
         }
-	FALLTHROUGH;
+        FALLTHROUGH;
         /* FALLTHRU */
     case MS_CUSS:
         if (!mtmp->mpeaceful)