diff --git a/lxqt-sudo-prompt-fix.patch b/lxqt-sudo-prompt-fix.patch
new file mode 100644
index 0000000..abb5526
--- /dev/null
+++ b/lxqt-sudo-prompt-fix.patch
@@ -0,0 +1,26 @@
+---
+ sudo.cpp |    6 ++++--
+ 1 file changed, 4 insertions(+), 2 deletions(-)
+
+--- a/sudo.cpp
++++ b/sudo.cpp
+@@ -52,7 +52,8 @@ namespace
+ 
+     const QString su_prog{QStringLiteral(LXQTSUDO_SU)};
+     const QString sudo_prog{QStringLiteral(LXQTSUDO_SUDO)};
+-    const QString pwd_prompt_end{QStringLiteral(": ")};
++    const QString pwd_prompt_end{QStringLiteral(":")};
++    const QString pwd_prompt_end_with_space{QStringLiteral(": ")};
+     const QChar nl{QLatin1Char('\n')};
+ 
+     void usage(QString const & err = QString())
+@@ -277,7 +278,8 @@ int Sudo::parent()
+                 lxqtApp->quit();
+             } else
+             {
+-                if (line.endsWith(pwd_prompt_end))
++                if (line.endsWith(pwd_prompt_end) ||
++                    line.endsWith(pwd_prompt_end_with_space))
+                 {
+                     //if now echo is turned off, su/sudo requests password
+                     struct termios tios;
diff --git a/lxqt-sudo.changes b/lxqt-sudo.changes
index d1910a5..4364661 100644
--- a/lxqt-sudo.changes
+++ b/lxqt-sudo.changes
@@ -1,3 +1,10 @@
+-------------------------------------------------------------------
+Thu Jul 12 16:13:40 CEST 2018 - tiwai@suse.de
+
+- Fix the missing capture of the prompt line without the space
+  letter at the end of line (boo#1100871):
+  lxqt-sudo-prompt-fix.patch
+
 -------------------------------------------------------------------
 Tue May 22 15:20:01 UTC 2018 - mvetter@suse.com
 
diff --git a/lxqt-sudo.spec b/lxqt-sudo.spec
index 16adfa5..125c6a0 100644
--- a/lxqt-sudo.spec
+++ b/lxqt-sudo.spec
@@ -26,6 +26,7 @@ URL:            http://lxqt.org
 Source:         https://github.com/lxqt/%{name}/releases/download/%{version}/%{name}-%{version}.tar.xz
 Source1:        https://github.com/lxqt/%{name}/releases/download/%{version}/%{name}-%{version}.tar.xz.asc
 Source2:        %{name}.keyring
+Patch1:         lxqt-sudo-prompt-fix.patch
 BuildRequires:  cmake >= 3.0.2
 BuildRequires:  gcc-c++
 BuildRequires:  lxqt-build-tools-devel >= 0.5.0
@@ -45,6 +46,7 @@ and (after submit) the password is provided to sudo.
 
 %prep
 %setup -q
+%patch1 -p1
 
 %build
 %cmake -DPULL_TRANSLATIONS=No