diff --git a/pkg/fixtures/12345678/http/http.go b/pkg/fixtures/12345678/http/http.go
new file mode 100644
index 00000000..ce7968b9
--- /dev/null
+++ b/pkg/fixtures/12345678/http/http.go
@@ -0,0 +1,3 @@
+package http
+
+type MyStruct struct{}
diff --git a/pkg/fixtures/same_name_imports.go b/pkg/fixtures/same_name_imports.go
index c00b3365..e88a4413 100644
--- a/pkg/fixtures/same_name_imports.go
+++ b/pkg/fixtures/same_name_imports.go
@@ -3,6 +3,7 @@ package test
 import (
 	"net/http"
 
+	number_dir_http "github.com/vektra/mockery/v2/pkg/fixtures/12345678/http"
 	my_http "github.com/vektra/mockery/v2/pkg/fixtures/http"
 )
 
@@ -10,4 +11,5 @@ import (
 type Example interface {
 	A() http.Flusher
 	B(fixtureshttp string) my_http.MyStruct
+	C(fixtureshttp string) number_dir_http.MyStruct
 }
diff --git a/pkg/generator.go b/pkg/generator.go
index 23e461c7..2941b48b 100644
--- a/pkg/generator.go
+++ b/pkg/generator.go
@@ -25,7 +25,7 @@ import (
 
 const mockConstructorParamTypeNamePrefix = "mockConstructorTestingT"
 
-var invalidIdentifierChar = regexp.MustCompile("[^[:digit:][:alpha:]_]")
+var invalidIdentifierChar = regexp.MustCompile("^[[:digit:]]|[^[:digit:][:alpha:]_]")
 
 func DetermineOutputPackageName(
 	interfaceFileName string,
diff --git a/pkg/generator_test.go b/pkg/generator_test.go
index 9afb4006..d99a27df 100644
--- a/pkg/generator_test.go
+++ b/pkg/generator_test.go
@@ -260,6 +260,7 @@ func (s *GeneratorSuite) TestGeneratorPrologueWithMultipleImportsSameName() {
 
 	expected := `package mocks
 
+import _2345678http "github.com/vektra/mockery/v2/pkg/fixtures/12345678/http"
 import fixtureshttp "github.com/vektra/mockery/v2/pkg/fixtures/http"
 import http "net/http"
 import mock "github.com/stretchr/testify/mock"