diff --git a/ROMFS/px4fmu_common/init.d/11001_hexa_cox b/ROMFS/px4fmu_common/init.d/11001_hexa_cox
index b98ab47748d..38e65435b65 100644
--- a/ROMFS/px4fmu_common/init.d/11001_hexa_cox
+++ b/ROMFS/px4fmu_common/init.d/11001_hexa_cox
@@ -2,7 +2,7 @@
 #
 # UNTESTED UNTESTED!
 #
-# Generic 10” Hexa coaxial geometry
+# Generic 10" Hexa coaxial geometry
 #
 # Lorenz Meier <lm@inf.ethz.ch>
 #
diff --git a/ROMFS/px4fmu_common/init.d/12001_octo_cox b/ROMFS/px4fmu_common/init.d/12001_octo_cox
index 655cb6226ef..99f902a6dd9 100644
--- a/ROMFS/px4fmu_common/init.d/12001_octo_cox
+++ b/ROMFS/px4fmu_common/init.d/12001_octo_cox
@@ -1,6 +1,6 @@
 #!nsh
 #
-# Generic 10” Octo coaxial geometry
+# Generic 10" Octo coaxial geometry
 #
 # Lorenz Meier <lm@inf.ethz.ch>
 #
diff --git a/ROMFS/px4fmu_common/init.d/4001_quad_x b/ROMFS/px4fmu_common/init.d/4001_quad_x
index 345b0e3e4ef..06c54a41dba 100644
--- a/ROMFS/px4fmu_common/init.d/4001_quad_x
+++ b/ROMFS/px4fmu_common/init.d/4001_quad_x
@@ -1,6 +1,6 @@
 #!nsh
 #
-# Generic 10” Quad X geometry
+# Generic 10" Quad X geometry
 #
 # Lorenz Meier <lm@inf.ethz.ch>
 #
diff --git a/ROMFS/px4fmu_common/init.d/5001_quad_+ b/ROMFS/px4fmu_common/init.d/5001_quad_+
index 55b31067d1f..1fb25e5d88a 100644
--- a/ROMFS/px4fmu_common/init.d/5001_quad_+
+++ b/ROMFS/px4fmu_common/init.d/5001_quad_+
@@ -1,6 +1,6 @@
 #!nsh
 #
-# Generic 10” Quad + geometry
+# Generic 10" Quad + geometry
 #
 # Anton Babushkin <anton.babushkin@me.com>
 #
diff --git a/ROMFS/px4fmu_common/init.d/6001_hexa_x b/ROMFS/px4fmu_common/init.d/6001_hexa_x
index 7714a508cfc..34fc6523fef 100644
--- a/ROMFS/px4fmu_common/init.d/6001_hexa_x
+++ b/ROMFS/px4fmu_common/init.d/6001_hexa_x
@@ -1,6 +1,6 @@
 #!nsh
 #
-# Generic 10” Hexa X geometry
+# Generic 10" Hexa X geometry
 #
 # Anton Babushkin <anton.babushkin@me.com>
 #
diff --git a/ROMFS/px4fmu_common/init.d/7001_hexa_+ b/ROMFS/px4fmu_common/init.d/7001_hexa_+
index 60db8c06904..235e376a6ee 100644
--- a/ROMFS/px4fmu_common/init.d/7001_hexa_+
+++ b/ROMFS/px4fmu_common/init.d/7001_hexa_+
@@ -1,6 +1,6 @@
 #!nsh
 #
-# Generic 10” Hexa + geometry
+# Generic 10" Hexa + geometry
 #
 # Anton Babushkin <anton.babushkin@me.com>
 #
diff --git a/ROMFS/px4fmu_common/init.d/8001_octo_x b/ROMFS/px4fmu_common/init.d/8001_octo_x
index 411aee1140d..769217dc78b 100644
--- a/ROMFS/px4fmu_common/init.d/8001_octo_x
+++ b/ROMFS/px4fmu_common/init.d/8001_octo_x
@@ -1,6 +1,6 @@
 #!nsh
 #
-# Generic 10” Octo X geometry
+# Generic 10" Octo X geometry
 #
 # Anton Babushkin <anton.babushkin@me.com>
 #
diff --git a/ROMFS/px4fmu_common/init.d/9001_octo_+ b/ROMFS/px4fmu_common/init.d/9001_octo_+
index 81132fd3e70..28b074a545a 100644
--- a/ROMFS/px4fmu_common/init.d/9001_octo_+
+++ b/ROMFS/px4fmu_common/init.d/9001_octo_+
@@ -1,6 +1,6 @@
 #!nsh
 #
-# Generic 10” Octo + geometry
+# Generic 10" Octo + geometry
 #
 # Anton Babushkin <anton.babushkin@me.com>
 #