diff --git a/libtcc.c b/libtcc.c
index 6aa2afd0..64dae664 100644
--- a/libtcc.c
+++ b/libtcc.c
@@ -1247,7 +1247,7 @@ ST_FUNC int set_flag(TCCState *s, const FlagDef *flags, const char *name)
                 continue;
         }
         if (p->offset) {
-            *(int*)((char *)s + p->offset) =
+            *((unsigned char *)s + p->offset) =
                 p->flags & FD_INVERT ? !value : value;
             if (ret)
                 return 0;
diff --git a/tcc.h b/tcc.h
index cd35a1ab..b6a46069 100644
--- a/tcc.h
+++ b/tcc.h
@@ -731,7 +731,7 @@ struct TCCState {
     int seg_size; /* 32. Can be 16 with i386 assembler (.code16) */
 #endif
 #ifdef TCC_TARGET_X86_64
-    int nosse; /* For -mno-sse support. */
+    unsigned char nosse; /* For -mno-sse support. */
 #endif
 
     /* array of all loaded dlls (including those referenced by loaded dlls) */