diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2751dfe64a0..fbf7c9f6fa7 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2021-01-09  Tom Tromey  <tom@tromey.com>
+
+	PR compile/23672
+	* compile/compile.c (compile_to_object): Avoid crash when
+	osabi_triplet_regexp returns NULL.
+
 2021-01-09  Tom Tromey  <tom@tromey.com>
 
 	* tracepoint.h (class collection_list) <append_exp>: Take a
diff --git a/gdb/compile/compile.c b/gdb/compile/compile.c
index d4c0034452d..074a865f9cc 100644
--- a/gdb/compile/compile.c
+++ b/gdb/compile/compile.c
@@ -703,7 +703,9 @@ compile_to_object (struct command_line *cmd, const char *cmd_string,
       const char *arch_rx = gdbarch_gnu_triplet_regexp (gdbarch);
 
       /* Allow triplets with or without vendor set.  */
-      triplet_rx = std::string (arch_rx) + "(-[^-]*)?-" + os_rx;
+      triplet_rx = std::string (arch_rx) + "(-[^-]*)?-";
+      if (os_rx != nullptr)
+	triplet_rx += os_rx;
       compiler->set_triplet_regexp (triplet_rx.c_str ());
     }