diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56931796..1ce1abe3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,11 @@ and this project adheres to
 
 ## [unreleased]
 
+### Fixed
+
+- Return an empty array to avoid depext failure when depext flags are not
+  passed.
+
 ## [2.0.0-beta6]
 
 ### Changed
diff --git a/dist/index.js b/dist/index.js
index 2fc77c46..9ab17bc2 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -114988,7 +114988,8 @@ const OCAML_COMPILER = lib_core.getInput("ocaml-compiler");
 const OPAM_DEPEXT = lib_core.getBooleanInput("opam-depext");
 const OPAM_DEPEXT_FLAGS = lib_core.getInput("opam-depext-flags")
     .split(",")
-    .map((f) => f.trim());
+    .map((f) => f.trim())
+    .filter((f) => f.length > 0);
 const OPAM_DISABLE_SANDBOXING = lib_core.getBooleanInput("opam-disable-sandboxing");
 const OPAM_LOCAL_PACKAGES = lib_core.getInput("opam-local-packages");
 const OPAM_PIN = lib_core.getBooleanInput("opam-pin");
diff --git a/dist/post/index.js b/dist/post/index.js
index 6d63bfdc..798972b4 100644
--- a/dist/post/index.js
+++ b/dist/post/index.js
@@ -113801,7 +113801,8 @@ const constants_OCAML_COMPILER = lib_core.getInput("ocaml-compiler");
 const OPAM_DEPEXT = lib_core.getBooleanInput("opam-depext");
 const OPAM_DEPEXT_FLAGS = lib_core.getInput("opam-depext-flags")
     .split(",")
-    .map((f) => f.trim());
+    .map((f) => f.trim())
+    .filter((f) => f.length > 0);
 const constants_OPAM_DISABLE_SANDBOXING = lib_core.getBooleanInput("opam-disable-sandboxing");
 const OPAM_LOCAL_PACKAGES = lib_core.getInput("opam-local-packages");
 const OPAM_PIN = lib_core.getBooleanInput("opam-pin");
diff --git a/src/constants.ts b/src/constants.ts
index 2b621dc0..25abb9e4 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -26,7 +26,8 @@ export const OPAM_DEPEXT = core.getBooleanInput("opam-depext");
 export const OPAM_DEPEXT_FLAGS = core
   .getInput("opam-depext-flags")
   .split(",")
-  .map((f) => f.trim());
+  .map((f) => f.trim())
+  .filter((f) => f.length > 0);
 
 export const OPAM_DISABLE_SANDBOXING = core.getBooleanInput(
   "opam-disable-sandboxing"