diff --git a/.gitignore b/.gitignore
index ca86d3acd..4899b754e 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,3 @@
-*.a
 *.bin
 *.map
 *.png
diff --git a/cpu/arm/stm32l152/e_stdio_intonly_thumb2.a b/cpu/arm/stm32l152/e_stdio_intonly_thumb2.a
new file mode 100644
index 000000000..bd3878d65
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diff --git a/cpu/arm/stm32l152/e_stdio_thumb2.a b/cpu/arm/stm32l152/e_stdio_thumb2.a
new file mode 100644
index 000000000..61c4323c9
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diff --git a/cpu/arm/stm32l152/smallprintf_thumb2.a b/cpu/arm/stm32l152/smallprintf_thumb2.a
new file mode 100644
index 000000000..30d31872a
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