diff --git a/jsonbasics/jsonbasics.go b/jsonbasics/jsonbasics.go
index c76a879..87b93c1 100644
--- a/jsonbasics/jsonbasics.go
+++ b/jsonbasics/jsonbasics.go
@@ -199,8 +199,9 @@ func GetBoolIndex(arr []interface{}, index int) (bool, error) {
 func GetUInt64Field(object map[string]interface{}, fieldName string) (uint64, error) {
 	value, err := GetFloat64Field(object, fieldName)
 	if err == nil {
-		if value == float64(int(value)) {
-			return uint64(value), nil
+		uivalue := uint64(value)
+		if value == float64(uivalue) {
+			return uivalue, nil
 		}
 	}
 	return 0, fmt.Errorf("expected key '%s' to be an unsigned integer", fieldName)
@@ -211,13 +212,40 @@ func GetUInt64Field(object map[string]interface{}, fieldName string) (uint64, er
 func GetUInt64Index(arr []interface{}, index int) (uint64, error) {
 	value, err := GetFloat64Index(arr, index)
 	if err == nil {
-		if value == float64(int(value)) {
-			return uint64(value), nil
+		uivalue := uint64(value)
+		if value == float64(uivalue) {
+			return uivalue, nil
 		}
 	}
 	return 0, fmt.Errorf("expected index '%d' to be an unsigned integer", index)
 }
 
+// GetInt64Field returns an int64 from an object field. Returns an error if the field
+// is not an integer, or is not found.
+func GetInt64Field(object map[string]interface{}, fieldName string) (int64, error) {
+	value, err := GetFloat64Field(object, fieldName)
+	if err == nil {
+		ivalue := int64(value)
+		if value == float64(ivalue) {
+			return ivalue, nil
+		}
+	}
+	return 0, fmt.Errorf("expected key '%s' to be an integer", fieldName)
+}
+
+// GetInt64Index returns an int64-value from an array index. Returns an error if the entry
+// is not an integer.
+func GetInt64Index(arr []interface{}, index int) (int64, error) {
+	value, err := GetFloat64Index(arr, index)
+	if err == nil {
+		ivalue := int64(value)
+		if value == float64(ivalue) {
+			return ivalue, nil
+		}
+	}
+	return 0, fmt.Errorf("expected index '%d' to be an integer", index)
+}
+
 // GetFloat64Field returns a float64 from an object field. Returns an error if the field
 // is not a float, or is not found.
 func GetFloat64Field(object map[string]interface{}, fieldName string) (float64, error) {
diff --git a/jsonbasics/jsonbasics_test.go b/jsonbasics/jsonbasics_test.go
index 716dddd..270e67a 100644
--- a/jsonbasics/jsonbasics_test.go
+++ b/jsonbasics/jsonbasics_test.go
@@ -200,4 +200,118 @@ var _ = Describe("jsonbasics", func() {
 		PIt("still to do", func() {
 		})
 	})
+
+	Describe("GetFloat64Index", func() {
+		It("returns the float or error", func() {
+			data := []interface{}{
+				1.5,
+				-1.5,
+				"text",
+			}
+			val, err := GetFloat64Index(data, 0)
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(1.5))
+			val, err = GetFloat64Index(data, 1)
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(-1.5))
+			val, err = GetFloat64Index(data, 2)
+			Expect(err).To(MatchError("expected index '2' to be a float"))
+			Expect(val).To(BeEquivalentTo(0))
+		})
+	})
+
+	Describe("GetFloat64Field", func() {
+		It("returns the float or error", func() {
+			data := map[string]interface{}{
+				"one":   1.5,
+				"two":   -1.5,
+				"three": "text",
+			}
+			val, err := GetFloat64Field(data, "one")
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(1.5))
+			val, err = GetFloat64Field(data, "two")
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(-1.5))
+			val, err = GetFloat64Field(data, "three")
+			Expect(err).To(MatchError("expected key 'three' to be a float"))
+			Expect(val).To(BeEquivalentTo(0))
+		})
+	})
+
+	Describe("GetInt64Index", func() {
+		It("returns the integer or error", func() {
+			data := []interface{}{
+				1,
+				-1,
+				1.5,
+			}
+			val, err := GetInt64Index(data, 0)
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(int64(1)))
+			val, err = GetInt64Index(data, 1)
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(int64(-1)))
+			val, err = GetInt64Index(data, 2)
+			Expect(err).To(MatchError("expected index '2' to be an integer"))
+			Expect(val).To(BeEquivalentTo(0))
+		})
+	})
+
+	Describe("GetInt64Field", func() {
+		It("returns the integer or error", func() {
+			data := map[string]interface{}{
+				"one":   1,
+				"two":   -1,
+				"three": 1.5,
+			}
+			val, err := GetInt64Field(data, "one")
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(int64(1)))
+			val, err = GetInt64Field(data, "two")
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(int64(-1)))
+			val, err = GetInt64Field(data, "three")
+			Expect(err).To(MatchError("expected key 'three' to be an integer"))
+			Expect(val).To(BeEquivalentTo(0))
+		})
+	})
+
+	Describe("GetUInt64Index", func() {
+		It("Returns the unsigned integer or error", func() {
+			data := []interface{}{
+				uint64(1),
+				uint64(2),
+				1.5,
+			}
+			val, err := GetUInt64Index(data, 0)
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(uint64(1)))
+			val, err = GetUInt64Index(data, 1)
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(uint64(2)))
+			val, err = GetUInt64Index(data, 2)
+			Expect(err).To(MatchError("expected index '2' to be an unsigned integer"))
+			Expect(val).To(BeEquivalentTo(0))
+		})
+	})
+
+	Describe("GetUInt64Field", func() {
+		It("returns the unsigned integer or error", func() {
+			data := map[string]interface{}{
+				"one":   uint64(1),
+				"two":   uint64(2),
+				"three": 1.5,
+			}
+			val, err := GetUInt64Field(data, "one")
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(uint64(1)))
+			val, err = GetUInt64Field(data, "two")
+			Expect(err).To(BeNil())
+			Expect(val).To(BeEquivalentTo(uint64(2)))
+			val, err = GetUInt64Field(data, "three")
+			Expect(err).To(MatchError("expected key 'three' to be an unsigned integer"))
+			Expect(val).To(BeEquivalentTo(0))
+		})
+	})
 })
diff --git a/openapi2kong/openapi2kong.go b/openapi2kong/openapi2kong.go
index 69f46e3..cb0b039 100644
--- a/openapi2kong/openapi2kong.go
+++ b/openapi2kong/openapi2kong.go
@@ -1096,7 +1096,7 @@ func Convert(content []byte, opts O2kOptions) (map[string]interface{}, error) {
 				route["regex_priority"] = regexPriority
 			} else {
 				// a regex_priority was provided in the defaults
-				currentRegexPrio, err := jsonbasics.GetUInt64Field(route, "regex_priority")
+				currentRegexPrio, err := jsonbasics.GetInt64Field(route, "regex_priority")
 				if err != nil {
 					return nil, fmt.Errorf("failed to parse 'regex_priority' from route defaults: %w", err)
 				}