diff --git a/stb_image_write.h b/stb_image_write.h
index 3316feb..6ec21af 100644
--- a/stb_image_write.h
+++ b/stb_image_write.h
@@ -774,7 +774,7 @@ STBIWDEF int stbi_write_hdr(char const *filename, int x, int y, int comp, const
 
 #ifndef STBIW_ZLIB_COMPRESS
 // stretchy buffer; stbiw__sbpush() == vector<>::push_back() -- stbiw__sbcount() == vector<>::size()
-#define stbiw__sbraw(a) ((int *) (a) - 2)
+#define stbiw__sbraw(a) ((int *) (void *) (a) - 2)
 #define stbiw__sbm(a)   stbiw__sbraw(a)[0]
 #define stbiw__sbn(a)   stbiw__sbraw(a)[1]
 
diff --git a/stretchy_buffer.h b/stretchy_buffer.h
index cbd48a3..eaac47a 100644
--- a/stretchy_buffer.h
+++ b/stretchy_buffer.h
@@ -188,7 +188,7 @@
 #define stb_sb_add(a,n)        (stb__sbmaybegrow(a,n), stb__sbn(a)+=(n), &(a)[stb__sbn(a)-(n)])
 #define stb_sb_last(a)         ((a)[stb__sbn(a)-1])
 
-#define stb__sbraw(a) ((int *) (a) - 2)
+#define stb__sbraw(a) ((int *) (void *) (a) - 2)
 #define stb__sbm(a)   stb__sbraw(a)[0]
 #define stb__sbn(a)   stb__sbraw(a)[1]