diff --git a/src/pam/Makefile.am b/src/pam/Makefile.am
index 26864461..199dddd2 100644
--- a/src/pam/Makefile.am
+++ b/src/pam/Makefile.am
@@ -1,6 +1,6 @@
 # Process this file with automake to create Makefile.in
 
-libdir = ${prefix}/lib/security
+libdir = ${exec_prefix}/lib/security
 
 MAINTAINERCLEANFILES = Makefile.in
 
diff --git a/src/pkcs11/Makefile.am b/src/pkcs11/Makefile.am
index e0e04ab2..f9f2db2f 100644
--- a/src/pkcs11/Makefile.am
+++ b/src/pkcs11/Makefile.am
@@ -1,6 +1,6 @@
 # Process this file with automake to create Makefile.in
 
-libdir = ${prefix}/lib/pkcs11
+libdir = ${exec_prefix}/lib/pkcs11
 
 MAINTAINERCLEANFILES = Makefile.in
 
diff --git a/src/sia/Makefile.am b/src/sia/Makefile.am
index 73fc2a78..644fc95d 100644
--- a/src/sia/Makefile.am
+++ b/src/sia/Makefile.am
@@ -1,6 +1,6 @@
 # Process this file with automake to create Makefile.in
 
-libdir = ${prefix}/lib/security
+libdir = ${exec_prefix}/lib/security
 
 MAINTAINERCLEANFILES = Makefile.in