diff --git a/configs/spark/composite/defconfig b/configs/spark/composite/defconfig
index cea1150ae8..eb87a0efbb 100644
--- a/configs/spark/composite/defconfig
+++ b/configs/spark/composite/defconfig
@@ -465,7 +465,7 @@ CONFIG_SST25_SPIMODE=0
 CONFIG_SST25_SPIFREQUENCY=80000000
 # CONFIG_SST25_READONLY is not set
 CONFIG_SST25_SECTOR512=y
-CONFIG_SST25_SLOWWRITE=y
+# CONFIG_SST25_SLOWWRITE is not set
 # CONFIG_SST25_SLOWREAD is not set
 # CONFIG_MTD_SST39FV is not set
 # CONFIG_MTD_W25 is not set
diff --git a/configs/spark/nsh/defconfig b/configs/spark/nsh/defconfig
index 17a612408b..a520c16da6 100644
--- a/configs/spark/nsh/defconfig
+++ b/configs/spark/nsh/defconfig
@@ -439,7 +439,7 @@ CONFIG_SST25_SPIMODE=0
 CONFIG_SST25_SPIFREQUENCY=80000000
 # CONFIG_SST25_READONLY is not set
 CONFIG_SST25_SECTOR512=y
-CONFIG_SST25_SLOWWRITE=y
+# CONFIG_SST25_SLOWWRITE is not set
 # CONFIG_SST25_SLOWREAD is not set
 # CONFIG_MTD_SST39FV is not set
 # CONFIG_MTD_W25 is not set
diff --git a/configs/spark/usbmsc/defconfig b/configs/spark/usbmsc/defconfig
index b78e951d3b..468ddccb88 100644
--- a/configs/spark/usbmsc/defconfig
+++ b/configs/spark/usbmsc/defconfig
@@ -439,7 +439,7 @@ CONFIG_SST25_SPIMODE=0
 CONFIG_SST25_SPIFREQUENCY=80000000
 # CONFIG_SST25_READONLY is not set
 CONFIG_SST25_SECTOR512=y
-CONFIG_SST25_SLOWWRITE=y
+# CONFIG_SST25_SLOWWRITE is not set
 # CONFIG_SST25_SLOWREAD is not set
 # CONFIG_MTD_SST39FV is not set
 # CONFIG_MTD_W25 is not set