diff --git a/functionaljava-java25.patch b/functionaljava-java25.patch
new file mode 100644
index 0000000..afda26e
--- /dev/null
+++ b/functionaljava-java25.patch
@@ -0,0 +1,20 @@
+--- functionaljava-5.0/core/src/main/java/fj/Monoid.java	2025-10-23 17:44:13.280474920 +0200
++++ functionaljava-5.0/core/src/main/java/fj/Monoid.java	2025-10-23 17:50:46.140970970 +0200
+@@ -1,6 +1,7 @@
+ package fj;
+ 
+ import fj.data.*;
++import fj.data.IO;
+ 
+ import static fj.Function.*;
+ import static fj.Semigroup.semigroupDef;
+--- functionaljava-5.0/core/src/main/java/fj/P2.java	2025-10-23 17:44:13.280694593 +0200
++++ functionaljava-5.0/core/src/main/java/fj/P2.java	2025-10-23 17:48:14.924033452 +0200
+@@ -3,6 +3,7 @@
+ import static fj.Function.*;
+ import static fj.P.weakMemo;
+ import static fj.data.optic.PLens.pLens;
++import fj.data.IO;
+ import fj.data.*;
+ import fj.data.optic.Lens;
+ import fj.data.optic.PLens;
diff --git a/functionaljava.changes b/functionaljava.changes
index 26e5bd4..9a98f21 100644
--- a/functionaljava.changes
+++ b/functionaljava.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Thu Oct 23 15:52:09 UTC 2025 - Fridrich Strba <fstrba@suse.com>
+
+- Added patch:
+  * functionaljava-java25.patch
+    + disambiguate name class with the new java.lang.IO (Java 25)
+
 -------------------------------------------------------------------
 Tue Dec 13 12:33:31 UTC 2022 - Anton Shvetz <shvetz.anton@gmail.com>
 
diff --git a/functionaljava.spec b/functionaljava.spec
index 7e579ff..da5b971 100644
--- a/functionaljava.spec
+++ b/functionaljava.spec
@@ -26,6 +26,7 @@ URL:            http://www.functionaljava.org/
 Source0:        https://github.com/functionaljava/%{name}/archive/refs/tags/v%{version}.tar.gz#/%{name}-%{version}.tar.gz
 Source1:        https://repo1.maven.org/maven2/org/%{name}/%{name}/%{version}/%{name}-%{version}.pom
 Source2:        https://repo1.maven.org/maven2/org/%{name}/%{name}-java-core/%{version}/%{name}-java-core-%{version}.pom
+Patch0:         %{name}-java25.patch
 BuildRequires:  maven-local
 BuildArch:      noarch
 
@@ -59,6 +60,7 @@ API documentation for %{name}.
 
 %prep
 %setup -q
+%patch -P 0 -p1
 cp %{SOURCE1} core/pom.xml
 cp %{SOURCE2} java-core/pom.xml