diff --git a/buildscript/constants.toml b/buildscript/constants.toml
index 291e896..25d70fc 100644
--- a/buildscript/constants.toml
+++ b/buildscript/constants.toml
@@ -49,7 +49,7 @@ value = "1.602176634e-19 C"
 enum_name = "ElectronMass"
 pretty_name = "Electron mass"
 strings = ["electronmass"]
-value = "9.1093837015-31 kg"
+value = "9.1093837015e-31 kg"
 
 [[constant]]
 enum_name = "ProtonMass"
@@ -205,4 +205,4 @@ value = "TW * hour"
 [[constant]]
 enum_name = "PWH"
 strings = "PWh"
-value = "PW * hour"
\ No newline at end of file
+value = "PW * hour"