diff --git a/var/spack/repos/builtin/packages/upcxx/package.py b/var/spack/repos/builtin/packages/upcxx/package.py
index de6a43a7086..fe5fee91e14 100644
--- a/var/spack/repos/builtin/packages/upcxx/package.py
+++ b/var/spack/repos/builtin/packages/upcxx/package.py
@@ -194,6 +194,12 @@ def install(self, spec, prefix):
         if env.get("LDLIBS"):
             env["LIBS"] = env["LDLIBS"]
 
+        if spec.satisfies("%oneapi@2025:"):
+            env["CXXFLAGS"] = (
+                "-Wno-error=missing-template-arg-list-after-template-kw "
+                "-Wno-missing-template-arg-list-after-template-kw"
+            )
+
         options = ["--prefix=%s" % prefix]
 
         if "cross=none" in spec: