diff --git a/source/blender/blenlib/BLI_assert.h b/source/blender/blenlib/BLI_assert.h
index 685f526b4ad..7f7bec425ce 100644
--- a/source/blender/blenlib/BLI_assert.h
+++ b/source/blender/blenlib/BLI_assert.h
@@ -31,6 +31,7 @@ extern "C" {
 
 /* Utility functions. */
 void _BLI_assert_print_pos(const char *file, const int line, const char *function, const char *id);
+void _BLI_assert_print_extra(const char *str);
 void _BLI_assert_print_backtrace(void);
 void _BLI_assert_abort(void);
 void _BLI_assert_unreachable_print(const char *file, const int line, const char *function);
@@ -61,8 +62,17 @@ void _BLI_assert_unreachable_print(const char *file, const int line, const char
                       _BLI_ASSERT_ABORT(), \
                       NULL)) : \
                     NULL)
+/** A version of #BLI_assert() to pass an additional message to be printed on failure. */
+#  define BLI_assert_msg(a, msg) \
+    (void)((!(a)) ? ((_BLI_assert_print_backtrace(), \
+                      _BLI_ASSERT_PRINT_POS(a), \
+                      _BLI_assert_print_extra(msg), \
+                      _BLI_ASSERT_ABORT(), \
+                      NULL)) : \
+                    NULL)
 #else
 #  define BLI_assert(a) ((void)0)
+#  define BLI_assert_msg(a, msg) ((void)0)
 #endif
 
 #if defined(__cplusplus)
diff --git a/source/blender/blenlib/intern/BLI_assert.c b/source/blender/blenlib/intern/BLI_assert.c
index 887f583242f..cebc6f8957f 100644
--- a/source/blender/blenlib/intern/BLI_assert.c
+++ b/source/blender/blenlib/intern/BLI_assert.c
@@ -31,6 +31,11 @@ void _BLI_assert_print_pos(const char *file, const int line, const char *functio
   fprintf(stderr, "BLI_assert failed: %s:%d, %s(), at \'%s\'\n", file, line, function, id);
 }
 
+void _BLI_assert_print_extra(const char *str)
+{
+  fprintf(stderr, "  %s\n", str);
+}
+
 void _BLI_assert_unreachable_print(const char *file, const int line, const char *function)
 {
   fprintf(stderr, "Code marked as unreachable has been executed. Please report this as a bug.\n");