diff --git a/include/mruby/common.h b/include/mruby/common.h
index fd5c11022..e70fd4010 100644
--- a/include/mruby/common.h
+++ b/include/mruby/common.h
@@ -59,6 +59,26 @@ MRB_BEGIN_DECL
 # define mrb_deprecated
 #endif
 
+/** Declare a type or object as an alignment requirement. */
+#ifndef mrb_alignas
+# if defined(__cplusplus) && __cplusplus >= 201103L
+#  // https://en.cppreference.com/w/cpp/language/alignas
+#  define mrb_alignas(n) alignas(n)
+# elif defined(__STDC_VERSION__) && __STDC_VERSION__ >= 201112L
+#  // https://en.cppreference.com/w/c/language/_Alignas
+#  define mrb_alignas(n) _Alignas(n)
+# elif defined(_MSC_VER) || defined(__INTEL_COMPILER)
+#  // https://learn.microsoft.com/en-us/cpp/cpp/align-cpp?view=msvc-170
+#  define mrb_alignas(n) __declspec(align(n))
+# elif defined(__GNUC__) || defined(__clang__)
+#  // https://gcc.gnu.org/onlinedocs/gcc/Common-Type-Attributes.html#index-aligned-type-attribute
+#  define mrb_alignas(n) __attribute__((aligned(n)))
+# else
+#  // `mrb_alignas` defined as dummy. If necessary, send issues to https://github.com/mruby/mruby .
+#  define mrb_alignas(n)
+# endif
+#endif
+
 /** Declare a function as always inlined. */
 #if defined _MSC_VER && _MSC_VER < 1900
 # ifndef __cplusplus
diff --git a/mrbgems/mruby-catch/src/catch.c b/mrbgems/mruby-catch/src/catch.c
index 67db7f309..c1e59ae8e 100644
--- a/mrbgems/mruby-catch/src/catch.c
+++ b/mrbgems/mruby-catch/src/catch.c
@@ -37,6 +37,7 @@ static const mrb_irep catch_irep = {
   NULL,
   sizeof(catch_iseq),0,3,0,0
 };
+mrb_alignas(8)
 static const struct RProc catch_proc = {
   NULL, NULL, MRB_TT_PROC, MRB_GC_RED, MRB_FL_OBJ_IS_FROZEN | MRB_PROC_SCOPE | MRB_PROC_STRICT,
   { &catch_irep }, NULL, { NULL }
diff --git a/src/class.c b/src/class.c
index df74982f8..f0008a164 100644
--- a/src/class.c
+++ b/src/class.c
@@ -2915,6 +2915,7 @@ static const mrb_irep new_irep = {
   sizeof(new_iseq), 0, 2, 0, 0,
 };
 
+mrb_alignas(8)
 static const struct RProc new_proc = {
   NULL, NULL, MRB_TT_PROC, MRB_GC_RED, MRB_FL_OBJ_IS_FROZEN | MRB_PROC_SCOPE | MRB_PROC_STRICT,
   { &new_irep }, NULL, { NULL }
diff --git a/src/proc.c b/src/proc.c
index ad177635f..d020abe0a 100644
--- a/src/proc.c
+++ b/src/proc.c
@@ -36,6 +36,7 @@ static const mrb_irep call_irep = {
   0,                                   /* refcnt */
 };
 
+mrb_alignas(8)
 static const struct RProc call_proc = {
   NULL, NULL, MRB_TT_PROC, MRB_GC_RED, MRB_FL_OBJ_IS_FROZEN | MRB_PROC_SCOPE | MRB_PROC_STRICT,
   { &call_irep }, NULL, { NULL }