diff --git a/spectrum/src/main/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedDeserializer.java b/spectrum/src/main/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedDeserializer.java
index 4fa6d4e3..0f77c62d 100644
--- a/spectrum/src/main/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedDeserializer.java
+++ b/spectrum/src/main/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedDeserializer.java
@@ -10,7 +10,7 @@
 @Slf4j
 public abstract class InterpolatedDeserializer<T> extends JsonDeserializer<T> {
 
-    private static final Pattern PATTERN = Pattern.compile("(?<placeholder>\\$\\{(?<varName>[\\w.]+)(:-(?<defaultValue>[\\w~\\s-.:/\\\\]*))?})");
+    private static final Pattern PATTERN = Pattern.compile("(?<placeholder>\\$\\{(?<varName>[\\w.]+)(:-(?<defaultValue>[\\w~\\s-.:/\\\\=]*))?})");
 
     private final Vars vars = Vars.getInstance();
 
diff --git a/spectrum/src/main/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedObjectDeserializer.java b/spectrum/src/main/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedObjectDeserializer.java
index f414e2a6..b094be22 100644
--- a/spectrum/src/main/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedObjectDeserializer.java
+++ b/spectrum/src/main/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedObjectDeserializer.java
@@ -25,7 +25,7 @@
 public class InterpolatedObjectDeserializer extends JsonDeserializer<Object> {
 
     private static final InterpolatedObjectDeserializer INSTANCE = new InterpolatedObjectDeserializer();
-    private static final Pattern INT_PATTERN = Pattern.compile("(?<placeholder>\\$<(?<varName>[\\w.]+)(:-(?<defaultValue>[\\w~.:/\\\\]*))?>)");
+    private static final Pattern INT_PATTERN = Pattern.compile("(?<placeholder>\\$<(?<varName>[\\w.]+)(:-(?<defaultValue>[\\w~\\s-.:/\\\\=]*))?>)");
     private static final Pattern NUMBER = Pattern.compile("-?\\d+(.\\d+|,\\d+)?");
 
     private final Vars vars = Vars.getInstance();
diff --git a/spectrum/src/test/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedObjectDeserializerTest.java b/spectrum/src/test/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedObjectDeserializerTest.java
index 372034a3..41dcc4a8 100644
--- a/spectrum/src/test/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedObjectDeserializerTest.java
+++ b/spectrum/src/test/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedObjectDeserializerTest.java
@@ -261,7 +261,7 @@ static Stream<Arguments> valuesProvider() {
                 arguments("$<notSet:->", 0),
                 arguments("$<not.set>", 0),
                 arguments("$<notSet>", 0),
-                arguments("$<notSet:-stringDefault>", 0),
+                arguments("$<notSet:-~123stringDefault=va:lue.\\/>", 0),
                 arguments("$<varInEnv:-123>", Integer.parseInt(VAR_IN_ENV)),
                 arguments("$<varInEnv>", Integer.parseInt(VAR_IN_ENV))
         );
diff --git a/spectrum/src/test/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedStringDeserializerTest.java b/spectrum/src/test/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedStringDeserializerTest.java
index 582f91c6..79c16b18 100644
--- a/spectrum/src/test/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedStringDeserializerTest.java
+++ b/spectrum/src/test/java/io/github/giulong/spectrum/internals/jackson/deserializers/InterpolatedStringDeserializerTest.java
@@ -73,6 +73,7 @@ static Stream<Arguments> valuesProvider() {
                 arguments("${notSet:-${varInEnv:-local}}-nested", VAR_IN_ENV + "-nested"),
                 arguments("${notSet:-${varInEnv:-local}}-nested-${varInEnv}", VAR_IN_ENV + "-nested-" + VAR_IN_ENV),
                 arguments("${notSet:-local.dots}", "local.dots"),
+                arguments("${notSet:---key=value}", "--key=value"),
                 arguments("${notSet:-}", ""),
                 arguments("${varInEnv:-local}", VAR_IN_ENV),
                 arguments("${varInEnv}", VAR_IN_ENV),