diff --git a/eval.c b/eval.c
index 4adeb4ce54..833b9b0428 100644
--- a/eval.c
+++ b/eval.c
@@ -7149,7 +7149,11 @@ rb_thread_schedule()
     }
 
     FOREACH_THREAD_FROM(curr, th) {
-	if (th->status <= THREAD_RUNNABLE) {
+	if (th->status == THREAD_TO_KILL) {
+	    next = th;
+	    break;
+	}
+	if (th->status == THREAD_RUNNABLE) {
 	    if (!next || next->priority < th->priority) 
 	       next = th;
 	}
diff --git a/gc.c b/gc.c
index 8533773d3a..a7e272f257 100644
--- a/gc.c
+++ b/gc.c
@@ -753,19 +753,27 @@ obj_free(obj)
 	break;
       case T_STRING:
 #define STR_NO_ORIG FL_USER2	/* copied from string.c */
-	if (!RANY(obj)->as.string.orig || FL_TEST(obj, STR_NO_ORIG))
+	if (!RANY(obj)->as.string.orig || FL_TEST(obj, STR_NO_ORIG)) {
 	    free(RANY(obj)->as.string.ptr);
+	}
 	break;
       case T_ARRAY:
-	if (RANY(obj)->as.array.ptr) free(RANY(obj)->as.array.ptr);
+	if (RANY(obj)->as.array.ptr) {
+	    free(RANY(obj)->as.array.ptr);
+	}
 	break;
       case T_HASH:
-	if (RANY(obj)->as.hash.tbl)
+	if (RANY(obj)->as.hash.tbl) {
 	    st_free_table(RANY(obj)->as.hash.tbl);
+	}
 	break;
       case T_REGEXP:
-	if (RANY(obj)->as.regexp.ptr) re_free_pattern(RANY(obj)->as.regexp.ptr);
-	if (RANY(obj)->as.regexp.str) free(RANY(obj)->as.regexp.str);
+	if (RANY(obj)->as.regexp.ptr) {
+	    re_free_pattern(RANY(obj)->as.regexp.ptr);
+	}
+	if (RANY(obj)->as.regexp.str) {
+	    free(RANY(obj)->as.regexp.str);
+	}
 	break;
       case T_DATA:
 	if (DATA_PTR(obj)) {
@@ -798,7 +806,9 @@ obj_free(obj)
 	break;
 
       case T_BIGNUM:
-	if (RANY(obj)->as.bignum.digits) free(RANY(obj)->as.bignum.digits);
+	if (RANY(obj)->as.bignum.digits) {
+	    free(RANY(obj)->as.bignum.digits);
+	}
 	break;
       case T_NODE:
 	switch (nd_type(obj)) {
@@ -827,8 +837,9 @@ obj_free(obj)
 	break;
 
       case T_STRUCT:
-	if (RANY(obj)->as.rstruct.ptr)
+	if (RANY(obj)->as.rstruct.ptr) {
 	    free(RANY(obj)->as.rstruct.ptr);
+	}
 	break;
 
       default:
diff --git a/regex.c b/regex.c
index f1dcb3b77d..668773fb49 100644
--- a/regex.c
+++ b/regex.c
@@ -94,7 +94,7 @@ void xfree _((void*));
 #else
 # if defined(HAVE_ALLOCA_H)
 #  include <alloca.h>
-# else
+# elif !defined(alloca)
 char *alloca();
 # endif
 #endif /* __GNUC__ */