diff --git a/conda/artiq-kc705-nist_clock/meta.yaml b/conda/artiq-kc705-nist_clock/meta.yaml
index 47111dbb2..d55b7dd4a 100644
--- a/conda/artiq-kc705-nist_clock/meta.yaml
+++ b/conda/artiq-kc705-nist_clock/meta.yaml
@@ -7,6 +7,7 @@ source:
 
 build:
   noarch: generic
+  ignore_prefix_files: True
   number: {{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}
   string: py_{{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}+git{{ environ.get("GIT_FULL_HASH", "")[:8] }}
 
diff --git a/conda/artiq-kc705-nist_qc2/meta.yaml b/conda/artiq-kc705-nist_qc2/meta.yaml
index 9e545a830..26c5b48a6 100644
--- a/conda/artiq-kc705-nist_qc2/meta.yaml
+++ b/conda/artiq-kc705-nist_qc2/meta.yaml
@@ -7,6 +7,7 @@ source:
 
 build:
   noarch: generic
+  ignore_prefix_files: True
   number: {{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}
   string: py_{{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}+git{{ environ.get("GIT_FULL_HASH", "")[:8] }}
 
diff --git a/conda/artiq-pipistrello-nist_qc1/meta.yaml b/conda/artiq-pipistrello-nist_qc1/meta.yaml
index 8809cf8dc..3f4a13092 100644
--- a/conda/artiq-pipistrello-nist_qc1/meta.yaml
+++ b/conda/artiq-pipistrello-nist_qc1/meta.yaml
@@ -7,6 +7,7 @@ source:
 
 build:
   noarch: generic
+  ignore_prefix_files: True
   number: {{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}
   string: py_{{ environ.get("GIT_DESCRIBE_NUMBER", 0) }}+git{{ environ.get("GIT_FULL_HASH", "")[:8] }}