diff --git a/haystack/nodes/answer_generator/openai.py b/haystack/nodes/answer_generator/openai.py
index f18571e53..003812a91 100644
--- a/haystack/nodes/answer_generator/openai.py
+++ b/haystack/nodes/answer_generator/openai.py
@@ -20,7 +20,7 @@ from haystack.nodes.prompt import PromptTemplate
 
 logger = logging.getLogger(__name__)
 
-machine = platform.machine()
+machine = platform.machine().lower()
 system = platform.system()
 
 USE_TIKTOKEN = False
diff --git a/haystack/nodes/retriever/_openai_encoder.py b/haystack/nodes/retriever/_openai_encoder.py
index b8093be75..09134898a 100644
--- a/haystack/nodes/retriever/_openai_encoder.py
+++ b/haystack/nodes/retriever/_openai_encoder.py
@@ -25,7 +25,7 @@ if TYPE_CHECKING:
 
 logger = logging.getLogger(__name__)
 
-machine = platform.machine()
+machine = platform.machine().lower()
 system = platform.system()
 
 USE_TIKTOKEN = False
diff --git a/pyproject.toml b/pyproject.toml
index 3517c161c..8bc662c3b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -88,7 +88,7 @@ dependencies = [
   "elasticsearch>=7.7,<8",
 
   # OpenAI tokenizer
-  "tiktoken>=0.1.2; python_version >= '3.8' and (platform_machine == 'amd64' or platform_machine == 'x86_64' or (platform_machine == 'arm64' and platform_system == 'Darwin'))",
+  "tiktoken>=0.1.2; python_version >= '3.8' and (platform_machine == 'AMD64' or platform_machine == 'amd64' or platform_machine == 'x86_64' or (platform_machine == 'arm64' and platform_system == 'Darwin'))",
 
   # context matching
   "rapidfuzz>=2.0.15,<2.8.0",   # FIXME https://github.com/deepset-ai/haystack/pull/3199