diff --git a/tests/testsuite/cache_lock.rs b/tests/testsuite/cache_lock.rs
index 08f5b9e77..a507677d7 100644
--- a/tests/testsuite/cache_lock.rs
+++ b/tests/testsuite/cache_lock.rs
@@ -112,6 +112,10 @@ fn multiple_shared() {
     a_b_nested(CacheLockMode::Shared, CacheLockMode::Shared);
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn multiple_shared_separate() {
     // Test that two independent shared locks are safe to acquire at the same time.
@@ -213,6 +217,10 @@ fn readonly() {
     }
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn download_then_shared_separate() {
     a_then_b_separate_not_blocked(
@@ -222,6 +230,10 @@ fn download_then_shared_separate() {
     );
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn shared_then_download_separate() {
     a_then_b_separate_not_blocked(
@@ -231,6 +243,10 @@ fn shared_then_download_separate() {
     );
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn multiple_download_separate() {
     // Test that with two independent download locks, the second blocks until
@@ -241,6 +257,10 @@ fn multiple_download_separate() {
     );
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn multiple_mutate_separate() {
     // Test that with two independent mutate locks, the second blocks until
@@ -251,11 +271,19 @@ fn multiple_mutate_separate() {
     );
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn shared_then_mutate_separate() {
     a_then_b_separate_blocked(CacheLockMode::Shared, CacheLockMode::MutateExclusive);
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn download_then_mutate_separate() {
     a_then_b_separate_blocked(
@@ -264,6 +292,10 @@ fn download_then_mutate_separate() {
     );
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn mutate_then_download_separate() {
     a_then_b_separate_blocked(
@@ -272,6 +304,10 @@ fn mutate_then_download_separate() {
     );
 }
 
+#[cfg_attr(
+    target_os = "aix",
+    ignore = "Test fails on AIX due to unsupported flock behaviour"
+)]
 #[cargo_test]
 fn mutate_then_shared_separate() {
     a_then_b_separate_blocked(CacheLockMode::MutateExclusive, CacheLockMode::Shared);