diff --git a/src/Hydrators/PrestyledAssoc.php b/src/Hydrators/PrestyledAssoc.php
index f83dc2d..28cc0b5 100644
--- a/src/Hydrators/PrestyledAssoc.php
+++ b/src/Hydrators/PrestyledAssoc.php
@@ -11,6 +11,7 @@
 
 use function explode;
 use function is_array;
+use function strtolower;
 
 /**
  * Hydrates associative rows whose keys are pre-styled as `specifier__styledProp`.
@@ -41,7 +42,7 @@ public function hydrateAll(
         $grouped = [];
         foreach ($raw as $alias => $value) {
             [$prefix, $prop] = explode('__', $alias, 2);
-            $grouped[$prefix][$prop] = $value;
+            $grouped[strtolower($prefix)][$prop] = $value;
         }
 
         /** @var SplObjectStorage<object, Scope> $entities */
@@ -83,9 +84,13 @@ private function buildScopeMap(Scope $scope): array
             return $this->scopeMap;
         }
 
+        // Keys are lowercased: a column specifier survives the round-trip through
+        // the database as the alias case the driver chose (PostgreSQL folds
+        // unquoted identifiers to lower case, others preserve them), so the
+        // prefix is matched case-insensitively.
         $this->scopeMap = [];
         foreach (ScopeIterator::recursive($scope) as $spec => $c) {
-            $this->scopeMap[$spec] = $c;
+            $this->scopeMap[strtolower($spec)] = $c;
         }
 
         $this->cachedScope = $scope;
diff --git a/tests/Hydrators/PrestyledAssocTest.php b/tests/Hydrators/PrestyledAssocTest.php
index e729735..8cbd991 100644
--- a/tests/Hydrators/PrestyledAssocTest.php
+++ b/tests/Hydrators/PrestyledAssocTest.php
@@ -53,6 +53,26 @@ public function hydrateSingleEntity(): void
         $this->assertEquals('Alice', $this->factory->get($entity, 'name'));
     }
 
+    #[Test]
+    public function hydrateMatchesSpecifierPrefixCaseInsensitively(): void
+    {
+        // A camelCase scope name (`edgeCaseEntity`) becomes the column specifier;
+        // PostgreSQL folds the unquoted alias to lower case, so the row comes back
+        // prefixed `edgecaseentity__`. The prefix must still resolve to its scope.
+        $hydrator = new PrestyledAssoc($this->factory);
+        $scope = new Scope('edgeCaseEntity');
+
+        $result = $hydrator->hydrateAll(
+            ['edgecaseentity__initialized' => 'folded'],
+            $scope,
+        );
+
+        $this->assertNotFalse($result);
+        $this->assertCount(1, $result);
+        $result->rewind();
+        $this->assertEquals('folded', $this->factory->get($result->current(), 'initialized'));
+    }
+
     #[Test]
     public function hydrateMultipleEntitiesFromJoinedRow(): void
     {