diff --git a/extra/exports b/extra/exports
index 946739805ea39a4da51073729d909644e79997fb..3317ddbda5630f95db6dc1a6dfd18e9222e33827 100644
--- a/extra/exports
+++ b/extra/exports
@@ -242,6 +242,7 @@ box_error_last
 box_error_clear
 box_error_set
 error_set_prev
+error_unref
 box_latch_new
 box_latch_delete
 box_latch_lock
diff --git a/src/lib/core/diag.c b/src/lib/core/diag.c
index e143db18d90f0a6037b815c1e48e7a032d1a48c5..787f0f82a06bfbf4322a6b65e17f42e5329ac4f4 100644
--- a/src/lib/core/diag.c
+++ b/src/lib/core/diag.c
@@ -31,6 +31,26 @@
 #include "diag.h"
 #include "fiber.h"
 
+void
+error_unref(struct error *e)
+{
+	assert(e->refs > 0);
+	struct error *to_delete = e;
+	while (--to_delete->refs == 0) {
+		/* Unlink error from lists completely.*/
+		struct error *cause = to_delete->cause;
+		assert(to_delete->effect == NULL);
+		if (to_delete->cause != NULL) {
+			to_delete->cause->effect = NULL;
+			to_delete->cause = NULL;
+		}
+		to_delete->destroy(to_delete);
+		if (cause == NULL)
+			return;
+		to_delete = cause;
+	}
+}
+
 int
 error_set_prev(struct error *e, struct error *prev)
 {
diff --git a/src/lib/core/diag.h b/src/lib/core/diag.h
index 7a5454d1c1eed6d9b3b66ee61c59c3917cd11473..beb6a75289681f2caac1acd13541ba5a2e98fc8b 100644
--- a/src/lib/core/diag.h
+++ b/src/lib/core/diag.h
@@ -118,25 +118,8 @@ error_ref(struct error *e)
 	e->refs++;
 }
 
-static inline void
-error_unref(struct error *e)
-{
-	assert(e->refs > 0);
-	struct error *to_delete = e;
-	while (--to_delete->refs == 0) {
-		/* Unlink error from lists completely.*/
-		struct error *cause = to_delete->cause;
-		assert(to_delete->effect == NULL);
-		if (to_delete->cause != NULL) {
-			to_delete->cause->effect = NULL;
-			to_delete->cause = NULL;
-		}
-		to_delete->destroy(to_delete);
-		if (cause == NULL)
-			return;
-		to_delete = cause;
-	}
-}
+void
+error_unref(struct error *e);
 
 /**
  * Unlink error from its effect. For instance: