diff --git a/tracker/software/make/pp10a.make b/tracker/software/make/pp10a.make
index a311e623..a0432818 100644
--- a/tracker/software/make/pp10a.make
+++ b/tracker/software/make/pp10a.make
@@ -96,7 +96,7 @@ CMSISINC = ${CURDIR}/CMSIS/include
 CMSISLIB = ${CURDIR}/CMSIS/Lib/GCC
 
 # ChibiOS versions of system calls
-ALLSRC := $(CHIBIOS)/os/various/syscalls.c
+ALLCSRC := $(CHIBIOS)/os/various/syscalls.c
 
 # Licensing files.
 include $(CHIBIOS)/os/license/license.mk
diff --git a/tracker/software/make/pp10b.make b/tracker/software/make/pp10b.make
index 54b72c83..4fdc5369 100644
--- a/tracker/software/make/pp10b.make
+++ b/tracker/software/make/pp10b.make
@@ -96,7 +96,7 @@ CMSISINC = ${CURDIR}/CMSIS/include
 CMSISLIB = ${CURDIR}/CMSIS/Lib/GCC
 
 # ChibiOS versions of system calls
-ALLSRC := $(CHIBIOS)/os/various/syscalls.c
+ALLCSRC := $(CHIBIOS)/os/various/syscalls.c
 
 # Licensing files.
 include $(CHIBIOS)/os/license/license.mk