diff --git a/tests/flags.rs b/tests/flags.rs
index 006c29b3..3ad9a30f 100644
--- a/tests/flags.rs
+++ b/tests/flags.rs
@@ -18,6 +18,7 @@ const RGBA: u8 = 6;
 fn get_opts(input: &Path) -> (OutFile, oxipng::Options) {
     let mut options = oxipng::Options {
         force: true,
+        fast_evaluation: false,
         ..Default::default()
     };
     let mut filter = IndexSet::new();
diff --git a/tests/interlaced.rs b/tests/interlaced.rs
index 573c3182..7cbf8474 100644
--- a/tests/interlaced.rs
+++ b/tests/interlaced.rs
@@ -14,6 +14,7 @@ const RGBA: u8 = 6;
 fn get_opts(input: &Path) -> (OutFile, oxipng::Options) {
     let mut options = oxipng::Options {
         force: true,
+        fast_evaluation: false,
         ..Default::default()
     };
     let mut filter = IndexSet::new();
diff --git a/tests/reduction.rs b/tests/reduction.rs
index 7176ccca..07cbd20b 100644
--- a/tests/reduction.rs
+++ b/tests/reduction.rs
@@ -14,6 +14,7 @@ const RGBA: u8 = 6;
 fn get_opts(input: &Path) -> (OutFile, oxipng::Options) {
     let mut options = oxipng::Options {
         force: true,
+        fast_evaluation: false,
         ..Default::default()
     };
     let mut filter = IndexSet::new();