diff --git a/ports/teensy/Makefile b/ports/teensy/Makefile
index d3978718e0..cf9529442a 100644
--- a/ports/teensy/Makefile
+++ b/ports/teensy/Makefile
@@ -95,7 +95,6 @@ SRC_C = \
 	usb.c \
 
 STM_SRC_C = $(addprefix ports/stm32/,\
-	gccollect.c \
 	irq.c \
 	pin.c \
 	pin_named_pins.c \
diff --git a/ports/teensy/main.c b/ports/teensy/main.c
index df3fd1ffcf..d4c5f0396f 100644
--- a/ports/teensy/main.c
+++ b/ports/teensy/main.c
@@ -9,6 +9,7 @@
 #include "py/gc.h"
 #include "py/mphal.h"
 #include "gccollect.h"
+#include "lib/utils/gchelper.h"
 #include "lib/utils/pyexec.h"
 #include "lib/mp-readline/readline.h"
 #include "lexermemzip.h"
@@ -349,6 +350,12 @@ int main(void) {
     goto soft_reset;
 }
 
+void gc_collect(void) {
+    gc_collect_start();
+    gc_helper_collect_regs_and_stack();
+    gc_collect_end();
+}
+
 // stub out __libc_init_array. It's called by mk20dx128.c and is used to call
 // global C++ constructors. Since this is a C-only projects, we don't need to
 // call constructors.