diff --git a/.cirrus.yml b/.cirrus.yml
index ee84da446..e66677830 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -7,6 +7,7 @@ env:
   MAKEFLAGS: -j2
   BUILD: check
   ### secp256k1 config
+  ECMULTWINDOW: auto
   ECMULTGENPRECISION: auto
   ASM: no
   WIDEMUL: auto
@@ -68,8 +69,8 @@ task:
     - env: {BUILD: distcheck, WITH_VALGRIND: no, CTIMETEST: no, BENCH: no}
     - env: {CPPFLAGS: -DDETERMINISTIC}
     - env: {CFLAGS: -O0, CTIMETEST: no}
-    - env: { ECMULTGENPRECISION: 2 }
-    - env: { ECMULTGENPRECISION: 8 }
+    - env: { ECMULTGENPRECISION: 2, ECMULTWINDOW: 2 }
+    - env: { ECMULTGENPRECISION: 8, ECMULTWINDOW: 4 }
   matrix:
     - env:
         CC: gcc
@@ -303,6 +304,7 @@ task:
     - env:
         ASM: no
         ECMULTGENPRECISION: 2
+        ECMULTWINDOW: 2
   matrix:
     - env:
         CC: clang
diff --git a/ci/cirrus.sh b/ci/cirrus.sh
index c80070ba2..4379e2504 100755
--- a/ci/cirrus.sh
+++ b/ci/cirrus.sh
@@ -15,6 +15,7 @@ valgrind --version || true
 ./configure \
     --enable-experimental="$EXPERIMENTAL" \
     --with-test-override-wide-multiply="$WIDEMUL" --with-asm="$ASM" \
+    --with-ecmult-window="$ECMULTWINDOW" \
     --with-ecmult-gen-precision="$ECMULTGENPRECISION" \
     --enable-module-ecdh="$ECDH" --enable-module-recovery="$RECOVERY" \
     --enable-module-schnorrsig="$SCHNORRSIG" \