diff --git a/datatype.go b/datatype.go
index 81a87e6..bf86e06 100644
--- a/datatype.go
+++ b/datatype.go
@@ -22,6 +22,10 @@ func FixedHex(size uint) DataType {
 	return (DataType)(size<<16) | TypeHex
 }
 
+func (dtype DataType) baseType() DataType {
+	return dtype & 0xffff
+}
+
 func (dtype DataType) typeAndSize() (DataType, uint) {
 	return (dtype & 0xffff), uint(dtype >> 16)
 }
diff --git a/envconf.go b/envconf.go
index 6e2a538..c183e6e 100644
--- a/envconf.go
+++ b/envconf.go
@@ -287,7 +287,7 @@ func (c *Config) getRaw(key string, dtype DataType) (val cValue) {
 	if c.parsed {
 		key = cleanKey(key)
 		entry, ok := c.env[key]
-		if ok && (entry.dtype == dtype) {
+		if ok && (entry.dtype.baseType() == dtype.baseType()) {
 			return entry.parsed
 		}
 	}
@@ -303,7 +303,7 @@ func (c *Config) getRawMap(key string, dtype DataType) (empty map[string]cValue)
 
 		if ok {
 			for k, v := range entries {
-				if (v.dtype == dtype) && (v.parsed.err == nil) {
+				if (v.dtype.baseType() == dtype.baseType()) && (v.parsed.err == nil) {
 					retval[k] = v.parsed
 				} else {
 					return
@@ -324,8 +324,8 @@ func (c *Config) GetInt(key string) int64 {
 
 // Returns the value of an environment variable.
 // If the variable is not defined as envconf.TypeHex the function will return []byte{}.
-func (c *Config) GetHex(key string, size int) []byte {
-	val := c.getRaw(key, FixedHex(uint(size)))
+func (c *Config) GetHex(key string) []byte {
+	val := c.getRaw(key, TypeHex)
 	return val.binval
 }
 
@@ -400,9 +400,9 @@ func (c *Config) GetMapBool(key string) (retval map[string]bool) {
 	return
 }
 
-func (c *Config) GetMapHex(key string, size int) (retval map[string][]byte) {
+func (c *Config) GetMapHex(key string) (retval map[string][]byte) {
 	retval = make(map[string][]byte)
-	for k, v := range c.getRawMap(key, FixedHex(uint(size))) {
+	for k, v := range c.getRawMap(key, TypeHex) {
 		retval[k] = v.binval
 	}
 	return