diff --git a/libnumbertext.spec b/libnumbertext.spec
index 0a4d8a2..731abbb 100644
--- a/libnumbertext.spec
+++ b/libnumbertext.spec
@@ -12,7 +12,7 @@ Source:    https://github.com/Numbertext/libnumbertext/releases/download/1.0.bet
 Patch0:    libnumbertext-cxxflags.patch
 Patch1:    libnumbertext-updateautotools.patch
 
-BuildRequires: autoconf, automake, libtool
+BuildRequires: autoconf, automake, libtool, gcc-c++
 
 %description
 Language-neutral NUMBERTEXT and MONEYTEXT functions for LibreOffice Calc