diff --git a/openbabel.spec b/openbabel.spec
index 9431ab3..d18d86e 100644
--- a/openbabel.spec
+++ b/openbabel.spec
@@ -60,6 +60,7 @@ BuildRequires: libxml2-devel
 BuildRequires: swig
 BuildRequires: wxGTK3-devel
 BuildRequires: ImageMagick
+Requires: %{name}-libs%{?_isa} = %{version}-%{release}
 
 %description
 Open Babel is a free, open-source version of the Babel chemistry file
@@ -77,7 +78,6 @@ software.
 %package devel
 Summary: Development tools for programs which will use the Open Babel library
 Requires: %{name}-libs%{?_isa} = %{version}-%{release}
-Requires: pkgconfig
 
 %description devel
 The %{name}-devel package includes the header files and libraries
@@ -92,6 +92,7 @@ This package contains additional documentation for Open Babel.
 
 %package gui
 Summary: Chemistry software file format converter - GUI version
+Requires: %{name}-libs%{?_isa} = %{version}-%{release}
 
 %description gui
 Open Babel is a free, open-source version of the Babel chemistry file