diff --git a/hw/xfree86/os-support/bus/Makefile.am b/hw/xfree86/os-support/bus/Makefile.am
index 8069c664c..76ee4e4a5 100644
--- a/hw/xfree86/os-support/bus/Makefile.am
+++ b/hw/xfree86/os-support/bus/Makefile.am
@@ -12,7 +12,7 @@ PLATFORM_PCI_SOURCES = 460gxPCI.c altixPCI.c e8870PCI.c zx1PCI.c
 endif
 
 if LINUX_SPARC
-PLATFORM_PCI_SOURCE = sparcPci.c
+PLATFORM_PCI_SOURCES = sparcPci.c
 endif
 
 libbus_la_SOURCES = Pci.c $(PCI_SOURCES) $(PLATFORM_PCI_SOURCES)