diff --git a/src/irc/channel.cpp b/src/irc/channel.cpp
--- a/src/irc/channel.cpp
+++ b/src/irc/channel.cpp
@@ -239,6 +239,7 @@
     cipherLabel->hide();
     cipherLabel->setPixmap(KIconLoader::global()->loadIcon(QStringLiteral("document-encrypt"), KIconLoader::Toolbar));
     m_inputBar = new IRCInput(commandLineBox);
+    m_inputBar->setReferenceHeight(nicknameCombobox->height());
 
     commandLineLayout->addWidget(nicknameCombobox);
     commandLineLayout->addWidget(awayLabel);
diff --git a/src/viewer/ircinput.h b/src/viewer/ircinput.h
--- a/src/viewer/ircinput.h
+++ b/src/viewer/ircinput.h
@@ -36,6 +36,7 @@
 
         QSize sizeHint() const Q_DECL_OVERRIDE;
         QSize minimumSizeHint() const Q_DECL_OVERRIDE;
+        void setReferenceHeight(int h);
 
         bool event(QEvent* e) Q_DECL_OVERRIDE;
 
@@ -84,6 +85,7 @@
         QString m_lastCompletion;
         bool m_multiRow;
         int m_qtBoxPadding; //see comment in constructor
+        int m_referenceHeight = 0;
 
         QTimer* m_disableSpellCheckTimer;
 
diff --git a/src/viewer/ircinput.cpp b/src/viewer/ircinput.cpp
--- a/src/viewer/ircinput.cpp
+++ b/src/viewer/ircinput.cpp
@@ -96,7 +96,12 @@
 
 QSize IRCInput::minimumSizeHint() const
 {
-   return sizeHint();
+    return QSize(100, m_referenceHeight + 2 * frameWidth());
+}
+
+void IRCInput::setReferenceHeight(int h)
+{
+    m_referenceHeight = h;
 }
 
 void IRCInput::maybeResize()
diff --git a/src/viewer/statuspanel.cpp b/src/viewer/statuspanel.cpp
--- a/src/viewer/statuspanel.cpp
+++ b/src/viewer/statuspanel.cpp
@@ -57,6 +57,7 @@
     awayLabel->hide();
 
     m_inputBar=new IRCInput(commandLineBox);
+    m_inputBar->setReferenceHeight(nicknameCombobox->height());
     commandLineBoxLayout->addWidget(m_inputBar);
 
     getTextView()->installEventFilter(m_inputBar);