4 files changed, 8 insertions, 8 deletions
diff --git a/ext/digest/md5/md5init.c b/ext/digest/md5/md5init.c
index 17658f4fce..d1229b5c6e 100644
--- a/ext/digest/md5/md5init.c
+++ b/ext/digest/md5/md5init.c
@@ -8,7 +8,7 @@
 #include "md5.h"
 #endif
 
-static rb_digest_metadata_t md5 = {
+static const rb_digest_metadata_t md5 = {
     RUBY_DIGEST_API_VERSION,
     MD5_DIGEST_LENGTH,
     MD5_BLOCK_LENGTH,
@@ -36,5 +36,5 @@ Init_md5()
     cDigest_MD5 = rb_define_class_under(mDigest, "MD5", cDigest_Base);
 
     rb_ivar_set(cDigest_MD5, rb_intern("metadata"),
-      Data_Wrap_Struct(rb_cObject, 0, 0, &md5));
+      Data_Wrap_Struct(rb_cObject, 0, 0, (void *)&md5));
 }
diff --git a/ext/digest/rmd160/rmd160init.c b/ext/digest/rmd160/rmd160init.c
index 763867df86..0839f1b820 100644
--- a/ext/digest/rmd160/rmd160init.c
+++ b/ext/digest/rmd160/rmd160init.c
@@ -8,7 +8,7 @@
 #include "rmd160.h"
 #endif
 
-static rb_digest_metadata_t rmd160 = {
+static const rb_digest_metadata_t rmd160 = {
     RUBY_DIGEST_API_VERSION,
     RMD160_DIGEST_LENGTH,
     RMD160_BLOCK_LENGTH,
@@ -36,5 +36,5 @@ Init_rmd160()
     cDigest_RMD160 = rb_define_class_under(mDigest, "RMD160", cDigest_Base);
 
     rb_ivar_set(cDigest_RMD160, rb_intern("metadata"),
-      Data_Wrap_Struct(rb_cObject, 0, 0, &rmd160));
+      Data_Wrap_Struct(rb_cObject, 0, 0, (void *)&rmd160));
 }
diff --git a/ext/digest/sha1/sha1init.c b/ext/digest/sha1/sha1init.c
index b2146f05a9..d46a1cd67d 100644
--- a/ext/digest/sha1/sha1init.c
+++ b/ext/digest/sha1/sha1init.c
@@ -8,7 +8,7 @@
 #include "sha1.h"
 #endif
 
-static rb_digest_metadata_t sha1 = {
+static const rb_digest_metadata_t sha1 = {
     RUBY_DIGEST_API_VERSION,
     SHA1_DIGEST_LENGTH,
     SHA1_BLOCK_LENGTH,
@@ -36,5 +36,5 @@ Init_sha1()
     cDigest_SHA1 = rb_define_class_under(mDigest, "SHA1", cDigest_Base);
 
     rb_ivar_set(cDigest_SHA1, rb_intern("metadata"),
-      Data_Wrap_Struct(rb_cObject, 0, 0, &sha1));
+      Data_Wrap_Struct(rb_cObject, 0, 0, (void *)&sha1));
 }
diff --git a/ext/digest/sha2/sha2init.c b/ext/digest/sha2/sha2init.c
index c83a29316a..8b79e950a6 100644
--- a/ext/digest/sha2/sha2init.c
+++ b/ext/digest/sha2/sha2init.c
@@ -7,7 +7,7 @@
 #define FOREACH_BITLEN(func)	func(256) func(384) func(512)
 
 #define DEFINE_ALGO_METADATA(bitlen) \
-static rb_digest_metadata_t sha##bitlen = { \
+static const rb_digest_metadata_t sha##bitlen = { \
     RUBY_DIGEST_API_VERSION, \
     SHA##bitlen##_DIGEST_LENGTH, \
     SHA##bitlen##_BLOCK_LENGTH, \
@@ -46,7 +46,7 @@ Init_sha2()
     cDigest_SHA##bitlen = rb_define_class_under(mDigest, "SHA" #bitlen, cDigest_Base); \
 \
     rb_ivar_set(cDigest_SHA##bitlen, id_metadata, \
-      Data_Wrap_Struct(rb_cObject, 0, 0, &sha##bitlen));
+      Data_Wrap_Struct(rb_cObject, 0, 0, (void *)&sha##bitlen));
 
     FOREACH_BITLEN(DEFINE_ALGO_CLASS)
 }