diff --git a/docs/source/configuration/sup_globals.rst b/docs/source/configuration/sup_globals.rst
index bfa7582c..96ec3a05 100644
--- a/docs/source/configuration/sup_globals.rst
+++ b/docs/source/configuration/sup_globals.rst
@@ -195,8 +195,8 @@
       -  ``time_format`` :index:`: <pair: global options; time_format>` [string='%H-%M-%S'] Format used for the time we started the script. Uses the `strftime` format.
       -  ``time_reformat`` :index:`: <pair: global options; time_reformat>` [boolean=true] Tries to reformat the PCB/SCH date using the `date_format`.
          This assumes you let KiCad fill this value and hence the time is in ISO format (YY-MM-DD).
-      -  ``units`` :index:`: <pair: global options; units>` [string=''] [millimeters,inches,mils] Default units. Affects `position`, `bom` and `panelize` outputs.
-         Also KiCad 6 dimensions.
+      -  ``units`` :index:`: <pair: global options; units>` [string=''] [millimeters,inches,mils] Default units. Affects `position`, `bom` and `panelize` outputs and
+         the `erc` and `drc` preflights. Also KiCad 6 dimensions.
       -  ``use_dir_for_preflights`` :index:`: <pair: global options; use_dir_for_preflights>` [boolean=true] Use the global `dir` as subdir for the preflights.
       -  ``use_os_env_for_expand`` :index:`: <pair: global options; use_os_env_for_expand>` [boolean=true] In addition to KiCad text variables also use the OS environment variables when expanding `${VARIABLE}`.
       -  ``variant`` :index:`: <pair: global options; variant>` [string=''] Default variant to apply to all outputs.
diff --git a/docs/source/configuration/sup_preflights.rst b/docs/source/configuration/sup_preflights.rst
index e056107b..bf1b054a 100644
--- a/docs/source/configuration/sup_preflights.rst
+++ b/docs/source/configuration/sup_preflights.rst
@@ -58,6 +58,7 @@ Supported preflights
       -  ``format`` :index:`: <pair: preflight - erc; format>` [string|list(string)='HTML'][RPT,HTML,CSV,JSON] Format/s used for the report.
          You can specify multiple formats.
 
+      -  ``units`` :index:`: <pair: preflight - erc; units>` [string='millimeters'] [millimeters,inches,mils] Units used for the positions. Affected by global options.
       -  ``warnings_as_errors`` :index:`: <pair: preflight - erc; warnings_as_errors>` [boolean=false] ERC warnings are considered errors, they still reported as errors, but consider it an error.
 
 -  **erc_warnings**: :index:`: <pair: preflights; erc_warnings>` [boolean=false] **Deprecated**, use the `warnings_as_errors` option from `run_erc`.
diff --git a/kibot/globals.py b/kibot/globals.py
index 7d17c1ec..41d88a86 100644
--- a/kibot/globals.py
+++ b/kibot/globals.py
@@ -272,8 +272,8 @@ def __init__(self):
             """ Tries to reformat the PCB/SCH date using the `date_format`.
                 This assumes you let KiCad fill this value and hence the time is in ISO format (YY-MM-DD) """
             self.units = ''
-            """ [millimeters,inches,mils] Default units. Affects `position`, `bom` and `panelize` outputs.
-                Also KiCad 6 dimensions """
+            """ [millimeters,inches,mils] Default units. Affects `position`, `bom` and `panelize` outputs and
+                the `erc` and `drc` preflights. Also KiCad 6 dimensions """
             self.use_dir_for_preflights = True
             """ Use the global `dir` as subdir for the preflights """
             self.variant = ''
diff --git a/kibot/pre_erc.py b/kibot/pre_erc.py
index c787fb87..7c85433d 100644
--- a/kibot/pre_erc.py
+++ b/kibot/pre_erc.py
@@ -20,6 +20,7 @@
                    GENERATOR_CSS, W_ERC, W_FILXRC)
 from .log import get_logger
 logger = get_logger(__name__)
+UNITS_2_KICAD = {'millimeters': 'mm', 'inches': 'in', 'mils': 'mils'}
 
 
 def warning(msg):
@@ -59,6 +60,8 @@ def __init__(self):
             """ ERC warnings are considered errors, they still reported as errors, but consider it an error """
             self.dont_stop = False
             """ Continue even if we detect ERC errors """
+            self.units = 'millimeters'
+            """ [millimeters,inches,mils] Units used for the positions. Affected by global options """
         super().__init__()
         self.filters = FilterOptionsXRC
         self.set_doc('filters', " [list(dict)] Used to manipulate the ERC violations. Avoid using the *filters* preflight")
@@ -373,7 +376,8 @@ def run(self):
         output = outputs[0]
         os.makedirs(os.path.dirname(output), exist_ok=True)
         # Run the ERC from the CLI
-        cmd = ['kicad-cli', 'sch', 'erc', '-o', output, '--format', 'json', '--severity-all', GS.sch_file]
+        cmd = ['kicad-cli', 'sch', 'erc', '-o', output, '--format', 'json', '--severity-all',
+               '--units', UNITS_2_KICAD[self._units], GS.sch_file]
         logger.info('- Running the ERC')
         run_command(cmd)
         # Read the result
diff --git a/tests/yaml_samples/erc_no_w2_k8.kibot.yaml b/tests/yaml_samples/erc_no_w2_k8.kibot.yaml
index 351ed933..ef3c97e3 100644
--- a/tests/yaml_samples/erc_no_w2_k8.kibot.yaml
+++ b/tests/yaml_samples/erc_no_w2_k8.kibot.yaml
@@ -4,6 +4,7 @@ kibot:
 
 global:
   dir: 'def_dir'
+  units: mils
 
 preflight:
   erc: