diff --git a/src/system/boot/arch/arm/Jamfile b/src/system/boot/arch/arm/Jamfile
index 10fcc50699..378603af15 100644
--- a/src/system/boot/arch/arm/Jamfile
+++ b/src/system/boot/arch/arm/Jamfile
@@ -16,7 +16,7 @@ local kernelLibArchObjects =
 ;
 
 KernelMergeObject boot_arch_$(TARGET_ARCH).o :
-	uart.c
+	uart.cpp
 	arch_elf.cpp
 	arch_video.cpp
 	$(librootArchObjects)
@@ -25,7 +25,7 @@ KernelMergeObject boot_arch_$(TARGET_ARCH).o :
 	$(kernelLibArchObjects)
 ;
 
-SEARCH on [ FGristFiles arch_elf.cpp uart.c ]
+SEARCH on [ FGristFiles arch_elf.cpp uart.cpp ]
     = [ FDirName $(HAIKU_TOP) src system kernel arch $(TARGET_ARCH) ] ;
 
 SEARCH on [ FGristFiles $(librootArchObjects) ]