diff --git a/include/libcamera/ipa/meson.build b/include/libcamera/ipa/meson.build
index e72803b4e243..f3b4881c9c91 100644
--- a/include/libcamera/ipa/meson.build
+++ b/include/libcamera/ipa/meson.build
@@ -68,29 +68,28 @@ pipeline_ipa_mojom_mapping = {
     'vimc': 'vimc.mojom',
 }
 
-ipa_mojom_files = []
-ipa_mojoms = []
-
 #
 # Generate headers from templates.
 #
 
 # TODO Define per-pipeline ControlInfoMap with yaml?
 
+ipa_mojoms = []
+mojoms_built = []
 foreach pipeline, file : pipeline_ipa_mojom_mapping
     name = file.split('.')[0]
 
-    # Ensure we do not build duplicate mojom modules
-    if file in ipa_mojom_files
+    # Avoid building duplicate mojom interfaces with the same interface file
+    if name in mojoms_built
         continue
     endif
 
-    ipa_mojom_files += file
-
     if pipeline not in pipelines
         continue
     endif
 
+    mojoms_built += name
+
     # {interface}.mojom-module
     mojom = custom_target(name + '_mojom_module',
                           input : file,
@@ -155,6 +154,12 @@ foreach pipeline, file : pipeline_ipa_mojom_mapping
     libcamera_generated_ipa_headers += [header, serializer, proxy_header]
 endforeach
 
+ipa_mojom_files = []
+foreach pipeline, file : pipeline_ipa_mojom_mapping
+    if file not in ipa_mojom_files
+        ipa_mojom_files += file
+    endif
+endforeach
 ipa_mojom_files = files(ipa_mojom_files)
 
 # Pass this to the documentation generator in src/libcamera/ipa