diff --git a/src/dfmt/formatter.d b/src/dfmt/formatter.d
index cdc941b..004c0d5 100644
--- a/src/dfmt/formatter.d
+++ b/src/dfmt/formatter.d
@@ -949,8 +949,7 @@ private:
             formatAt();
             break;
         case tok!"!":
-            if ((peekIs(tok!"is") || peekIs(tok!"in"))
-                    && !peekBackIsOneOf(false, tok!"(", tok!"="))
+            if ((peekIs(tok!"is") || peekIs(tok!"in")) && !peekBackIsOperator())
                 write(" ");
             goto case;
         case tok!"...":
@@ -1488,7 +1487,7 @@ const pure @safe @nogc:
         return peekImplementation(tokenType, -1, ignoreComments);
     }
 
-    bool peekBackIsKeyword(bool ignoreComments = true)
+    bool peekBackIsKeyword(bool ignoreComments = true) pure nothrow const @nogc @safe
     {
         if (index == 0)
             return false;
@@ -1503,6 +1502,11 @@ const pure @safe @nogc:
         return isKeyword(tokens[i].type);
     }
 
+    bool peekBackIsOperator() pure nothrow const @nogc @safe
+    {
+        return index == 0 ? false : isOperator(tokens[index - 1].type);
+    }
+
     bool peekBackIsOneOf(bool ignoreComments, IdType[] tokenTypes...)
     {
         if (index == 0)
diff --git a/tests/allman/issue0208.d.ref b/tests/allman/issue0208.d.ref
new file mode 100644
index 0000000..7ee7fab
--- /dev/null
+++ b/tests/allman/issue0208.d.ref
@@ -0,0 +1,7 @@
+unittest
+{
+    if (a && !is(b == q))
+    {
+
+    }
+}
diff --git a/tests/issue0208.d b/tests/issue0208.d
new file mode 100644
index 0000000..b318881
--- /dev/null
+++ b/tests/issue0208.d
@@ -0,0 +1,7 @@
+unittest
+{
+	if (a && !is(b == q))
+	{
+
+	}
+}
diff --git a/tests/otbs/issue0208.d.ref b/tests/otbs/issue0208.d.ref
new file mode 100644
index 0000000..379e02c
--- /dev/null
+++ b/tests/otbs/issue0208.d.ref
@@ -0,0 +1,5 @@
+unittest {
+    if (a && !is(b == q)) {
+
+    }
+}