diff --git a/src/git_flow/command/base.py b/src/git_flow/command/base.py
index efc5c08..2e51eee 100644
--- a/src/git_flow/command/base.py
+++ b/src/git_flow/command/base.py
@@ -170,7 +170,7 @@ class Command(ABC):
 
     def get_branch_env_and_type(self, branch: str) -> tuple[str, str]:
         components = branch.split("/")
-        target_branches = self.flowconfig["flow.branches"].split(" ")
+        target_branches = self.flowconfig["flow.branches"].split(",")
 
         if len(components) == 2:
             if components[0] not in BRANCH_TYPES: