diff --git a/vars.go b/vars.go
index 658dfdd..0799ce9 100644
--- a/vars.go
+++ b/vars.go
@@ -25,7 +25,7 @@ func Rune(key string, defaultValue rune) rune {
 
 func Int(key string, defaultValue int) int {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseInt(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseInt(v, 10, 64); err == nil {
 			return int(v2)
 		}
 	}
@@ -34,7 +34,7 @@ func Int(key string, defaultValue int) int {
 
 func Int8(key string, defaultValue int8) int8 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseInt(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseInt(v, 10, 64); err == nil {
 			return int8(v2)
 		}
 	}
@@ -43,7 +43,7 @@ func Int8(key string, defaultValue int8) int8 {
 
 func Int16(key string, defaultValue int16) int16 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseInt(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseInt(v, 10, 64); err == nil {
 			return int16(v2)
 		}
 	}
@@ -52,7 +52,7 @@ func Int16(key string, defaultValue int16) int16 {
 
 func Int32(key string, defaultValue int32) int32 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseInt(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseInt(v, 10, 64); err == nil {
 			return int32(v2)
 		}
 	}
@@ -61,7 +61,7 @@ func Int32(key string, defaultValue int32) int32 {
 
 func Int64(key string, defaultValue int64) int64 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseInt(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseInt(v, 10, 64); err == nil {
 			return v2
 		}
 	}
@@ -70,7 +70,7 @@ func Int64(key string, defaultValue int64) int64 {
 
 func Uint8(key string, defaultValue uint8) uint8 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseUint(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseUint(v, 10, 64); err == nil {
 			return uint8(v2)
 		}
 	}
@@ -79,7 +79,7 @@ func Uint8(key string, defaultValue uint8) uint8 {
 
 func Uint16(key string, defaultValue uint16) uint16 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseUint(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseUint(v, 10, 64); err == nil {
 			return uint16(v2)
 		}
 	}
@@ -88,7 +88,7 @@ func Uint16(key string, defaultValue uint16) uint16 {
 
 func Uint32(key string, defaultValue uint32) uint32 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseUint(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseUint(v, 10, 64); err == nil {
 			return uint32(v2)
 		}
 	}
@@ -97,7 +97,7 @@ func Uint32(key string, defaultValue uint32) uint32 {
 
 func Uint64(key string, defaultValue uint64) uint64 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseUint(v, 10, 64); err != nil {
+		if v2, err := strconv.ParseUint(v, 10, 64); err == nil {
 			return v2
 		}
 	}
@@ -106,7 +106,7 @@ func Uint64(key string, defaultValue uint64) uint64 {
 
 func Float32(key string, defaultValue float32) float32 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseFloat(v, 64); err != nil {
+		if v2, err := strconv.ParseFloat(v, 64); err == nil {
 			return float32(v2)
 		}
 	}
@@ -115,7 +115,7 @@ func Float32(key string, defaultValue float32) float32 {
 
 func Float64(key string, defaultValue float64) float64 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseFloat(v, 64); err != nil {
+		if v2, err := strconv.ParseFloat(v, 64); err == nil {
 			return v2
 		}
 	}
@@ -124,7 +124,7 @@ func Float64(key string, defaultValue float64) float64 {
 
 func Complex64(key string, defaultValue complex64) complex64 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseComplex(v, 64); err != nil {
+		if v2, err := strconv.ParseComplex(v, 64); err == nil {
 			return complex64(v2)
 		}
 	}
@@ -133,7 +133,7 @@ func Complex64(key string, defaultValue complex64) complex64 {
 
 func Complex128(key string, defaultValue complex128) complex128 {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseComplex(v, 64); err != nil {
+		if v2, err := strconv.ParseComplex(v, 64); err == nil {
 			return v2
 		}
 	}
@@ -142,7 +142,7 @@ func Complex128(key string, defaultValue complex128) complex128 {
 
 func Bool(key string, defaultValue bool) bool {
 	if v, ok := os.LookupEnv(key); ok {
-		if v2, err := strconv.ParseBool(v); err != nil {
+		if v2, err := strconv.ParseBool(v); err == nil {
 			return v2
 		}
 	}