diff --git a/milli/src/update/index_documents/mod.rs b/milli/src/update/index_documents/mod.rs
index 1a1fc9a0e..5bce3b851 100644
--- a/milli/src/update/index_documents/mod.rs
+++ b/milli/src/update/index_documents/mod.rs
@@ -1987,4 +1987,51 @@ mod tests {
 
         assert_eq!(ids.len(), map.len());
     }
+
+    #[test]
+    fn primary_key_must_not_contain_floats() {
+        let tmp = tempfile::tempdir().unwrap();
+        let mut options = EnvOpenOptions::new();
+        options.map_size(4096 * 100);
+        let index = Index::new(options, tmp).unwrap();
+        let mut wtxn = index.write_txn().unwrap();
+        let indexer_config = IndexerConfig::default();
+        let builder = IndexDocuments::new(
+            &mut wtxn,
+            &index,
+            &indexer_config,
+            IndexDocumentsConfig::default(),
+            |_| (),
+        )
+        .unwrap();
+
+        let doc1 = documents! {[{
+            "id": -228142,
+            "title": "asdsad",
+        }]};
+
+        let doc2 = documents! {[{
+            "id": 228143.56,
+            "title": "something",
+        }]};
+
+        let doc3 = documents! {[{
+            "id": -228143.56,
+            "title": "something",
+        }]};
+
+        let doc4 = documents! {[{
+            "id": 2.0,
+            "title": "something",
+        }]};
+
+        let (builder, user_error) = builder.add_documents(doc1).unwrap();
+        user_error.unwrap();
+        let (builder, user_error) = builder.add_documents(doc2).unwrap();
+        assert!(user_error.is_err());
+        let (builder, user_error) = builder.add_documents(doc3).unwrap();
+        assert!(user_error.is_err());
+        let (_builder, user_error) = builder.add_documents(doc4).unwrap();
+        assert!(user_error.is_err());
+    }
 }
diff --git a/milli/src/update/index_documents/validate.rs b/milli/src/update/index_documents/validate.rs
index 0cb0b4aff..c69c754ac 100644
--- a/milli/src/update/index_documents/validate.rs
+++ b/milli/src/update/index_documents/validate.rs
@@ -108,7 +108,7 @@ pub fn validate_document_id_from_json(bytes: &[u8]) -> Result<StdResult<String,
                 return Ok(Err(UserError::InvalidDocumentId { document_id: Value::String(string) }))
             }
         },
-        Value::Number(number) => Ok(Ok(number.to_string())),
+        Value::Number(number) if number.is_i64() => Ok(Ok(number.to_string())),
         content => return Ok(Err(UserError::InvalidDocumentId { document_id: content.clone() })),
     }
 }