diff --git a/envconfig/config.go b/envconfig/config.go
index f4bd4aa6b..0aee21f9f 100644
--- a/envconfig/config.go
+++ b/envconfig/config.go
@@ -179,7 +179,8 @@ func BoolWithDefault(k string) func(defaultValue bool) bool {
 		if s := Var(k); s != "" {
 			b, err := strconv.ParseBool(s)
 			if err != nil {
-				return true
+				slog.Warn("invalid boolean value, using default", "key", k, "value", s, "default", defaultValue)
+				return defaultValue
 			}
 
 			return b
diff --git a/envconfig/config_test.go b/envconfig/config_test.go
index 1a9d77f07..d135f1a84 100644
--- a/envconfig/config_test.go
+++ b/envconfig/config_test.go
@@ -1,6 +1,7 @@
 package envconfig
 
 import (
+	"fmt"
 	"log/slog"
 	"math"
 	"os"
@@ -188,9 +189,12 @@ func TestBool(t *testing.T) {
 		"false": false,
 		"1":     true,
 		"0":     false,
-		// invalid values
-		"random":    true,
-		"something": true,
+		// invalid values fall back to default (false for Bool)
+		"random":    false,
+		"something": false,
+		"yes":       false,
+		"on":        false,
+		"enabled":   false,
 	}
 
 	for k, v := range cases {
@@ -203,6 +207,42 @@ func TestBool(t *testing.T) {
 	}
 }
 
+func TestBoolWithDefault(t *testing.T) {
+	cases := []struct {
+		value        string
+		defaultValue bool
+		expect       bool
+	}{
+		// valid values override the default
+		{"true", false, true},
+		{"false", true, false},
+		{"1", false, true},
+		{"0", true, false},
+		// empty value returns the default unchanged
+		{"", true, true},
+		{"", false, false},
+		// invalid values fall back to the default, not hardcoded true
+		{"yes", false, false},
+		{"yes", true, true},
+		{"on", false, false},
+		{"on", true, true},
+		{"enabled", false, false},
+		{"enabled", true, true},
+		{"random", false, false},
+		{"random", true, true},
+	}
+
+	for _, tt := range cases {
+		name := fmt.Sprintf("value=%q default=%v", tt.value, tt.defaultValue)
+		t.Run(name, func(t *testing.T) {
+			t.Setenv("OLLAMA_BOOL_WITH_DEFAULT", tt.value)
+			if b := BoolWithDefault("OLLAMA_BOOL_WITH_DEFAULT")(tt.defaultValue); b != tt.expect {
+				t.Errorf("%s: expected %v, got %v", name, tt.expect, b)
+			}
+		})
+	}
+}
+
 func TestUint(t *testing.T) {
 	cases := map[string]uint{
 		"0":    0,