diff --git a/NEWS b/NEWS
index e910addb1..c86426cde 100644
--- a/NEWS
+++ b/NEWS
@@ -49,6 +49,9 @@ arguments. The new syntax is documented in the Guile Reference manual.
    (<https://bugs.gnu.org/72547>)
 ** Fix compilation with GCC 14 and musl on 32-bit systems
    (<https://bugs.gnu.org/73835>)
+** Immutable stringbufs are now 8-byte aligned on all systems
+   Previously they could end up with an alignment that violated the type
+   tag for their type (e.g. ending up tagged as immediates SCM_IMP()).
 
 
 Changes in 3.0.10 (since 3.0.9)
diff --git a/libguile/strings.h b/libguile/strings.h
index f28ef3246..d417514f8 100644
--- a/libguile/strings.h
+++ b/libguile/strings.h
@@ -184,7 +184,7 @@ SCM_API SCM scm_makfromstrs (int argc, char **argv);
 
 #ifdef SCM_SUPPORT_STATIC_ALLOCATION
 #define SCM_IMMUTABLE_STRINGBUF(c_name, contents)	\
-  static SCM_UNUSED const				\
+  static SCM_UNUSED SCM_ALIGNED(8) const		\
   struct						\
   {							\
     scm_t_bits word_0;					\