diff --git a/mlir/lib/CAPI/CMakeLists.txt b/mlir/lib/CAPI/CMakeLists.txt
--- a/mlir/lib/CAPI/CMakeLists.txt
+++ b/mlir/lib/CAPI/CMakeLists.txt
@@ -3,7 +3,7 @@
 # aggregate below.
 set_property(GLOBAL APPEND PROPERTY MLIR_CAPI_LIBRARIES)
 function(add_mlir_upstream_c_api_library name)
-  add_mlir_public_c_api_library(${name} ${ARGN})
+  add_mlir_public_c_api_library(${name} ${ARGN} DISABLE_INSTALL)
   set_property(GLOBAL APPEND PROPERTY MLIR_CAPI_LIBRARIES ${name})
 endfunction()
 
diff --git a/mlir/test/python/lib/CMakeLists.txt b/mlir/test/python/lib/CMakeLists.txt
--- a/mlir/test/python/lib/CMakeLists.txt
+++ b/mlir/test/python/lib/CMakeLists.txt
@@ -29,5 +29,7 @@
   MLIRCAPIIR
   MLIRCAPIRegistration
   MLIRPythonTestDialect
+
+  DISABLE_INSTALL
 )