2 files changed, 11 insertions, 2 deletions
diff --git a/src/nvim/api/options.c b/src/nvim/api/options.c
index 3e7f7e8781..467a4720a6 100644
--- a/src/nvim/api/options.c
+++ b/src/nvim/api/options.c
@@ -53,7 +53,7 @@ static int validate_option_value_args(Dict(option) *opts, int *scope, int *opt_t
   }
 
   if (HAS_KEY(opts->win)) {
-    VALIDATE_T("win", kObjectTypeInteger, opts->win.type, {
+    VALIDATE_T_HANDLE("win", kObjectTypeWindow, opts->win.type, {
       return FAIL;
     });
 
@@ -65,7 +65,7 @@ static int validate_option_value_args(Dict(option) *opts, int *scope, int *opt_t
   }
 
   if (HAS_KEY(opts->buf)) {
-    VALIDATE_T("buf", kObjectTypeInteger, opts->buf.type, {
+    VALIDATE_T_HANDLE("buf", kObjectTypeBuffer, opts->buf.type, {
       return FAIL;
     });
 
diff --git a/src/nvim/api/private/validate.h b/src/nvim/api/private/validate.h
index 91a92c2762..a3e77ea838 100644
--- a/src/nvim/api/private/validate.h
+++ b/src/nvim/api/private/validate.h
@@ -67,6 +67,15 @@
     } \
   } while (0)
 
+/// Checks that actual_t is either the correct handle type or a type erased handle (integer)
+#define VALIDATE_T_HANDLE(name, expected_t, actual_t, code) \
+  do { \
+    if (expected_t != actual_t && kObjectTypeInteger != actual_t) { \
+      api_err_exp(err, name, api_typename(expected_t), api_typename(actual_t)); \
+      code; \
+    } \
+  } while (0)
+
 #define VALIDATE_RANGE(cond, name, code) \
   do { \
     if (!(cond)) { \