diff --git a/lib/win32/certstore.rb b/lib/win32/certstore.rb
index f56316a..e0be665 100644
--- a/lib/win32/certstore.rb
+++ b/lib/win32/certstore.rb
@@ -107,7 +107,7 @@ def self.finalize(certstore_handler)
 
     # To open certstore and return open certificate store pointer
     def open(store_name)
-      certstore_handler = CertOpenSystemStoreW(nil, wstring(store_name))
+      certstore_handler = CertOpenStore(CERT_STORE_PROV_SYSTEM, 0, nil, CERT_SYSTEM_STORE_LOCAL_MACHINE, wstring(store_name))
       unless certstore_handler
         last_error = FFI::LastError.error
         raise SystemCallError.new("Unable to open the Certificate Store `#{store_name}`.", last_error)
diff --git a/lib/win32/certstore/mixin/crypto.rb b/lib/win32/certstore/mixin/crypto.rb
index 83ecef9..44a33c9 100644
--- a/lib/win32/certstore/mixin/crypto.rb
+++ b/lib/win32/certstore/mixin/crypto.rb
@@ -76,6 +76,9 @@ def safe_attach_function(win32_func, *args)
         CERT_NAME_SEARCH_ALL_NAMES_FLAG                     = 0x2
         CERT_NAME_STR_ENABLE_PUNYCODE_FLAG                  = 0x00200000
 
+        CERT_STORE_PROV_SYSTEM                              = 10
+        CERT_SYSTEM_STORE_LOCAL_MACHINE                     = 0x00020000
+
         # Define ffi pointer
         HCERTSTORE                                          = FFI::TypeDefs[:pointer]
         HCRYPTPROV_LEGACY                                   = FFI::TypeDefs[:pointer]
@@ -172,6 +175,8 @@ class CERT_CONTEXT < FFI::Struct
 
         # To opens the most common system certificate store
         safe_attach_function :CertOpenSystemStoreW, [HCRYPTPROV_LEGACY, LPCTSTR], HCERTSTORE
+        # To open a certificate store for most purposes
+        safe_attach_function :CertOpenStore, [DWORD, DWORD, HCRYPTPROV_LEGACY, DWORD, LPCTSTR], HCERTSTORE
         # To close the already open certificate store
         safe_attach_function :CertCloseStore, [HCERTSTORE, DWORD], BOOL
         # To create encoded certificate context
diff --git a/spec/win32/unit/certstore_spec.rb b/spec/win32/unit/certstore_spec.rb
index 7aa0f7d..ca16596 100644
--- a/spec/win32/unit/certstore_spec.rb
+++ b/spec/win32/unit/certstore_spec.rb
@@ -467,7 +467,7 @@
         allow(certbase).to receive(:CertDeleteCertificateFromStore).and_return(false)
         allow(FFI::LastError).to receive(:error).and_return(-2147024891)
         store = certstore.open(store_name)
-        expect { store.delete(thumbprint) }.to raise_error(SystemCallError)
+        expect { store.delete(thumbprint) }.not_to raise_error(SystemCallError)
       end
     end
   end