diff --git a/eos/saveddata/boosterSideEffect.py b/eos/saveddata/boosterSideEffect.py
index 5b468c91c..4fd83591c 100644
--- a/eos/saveddata/boosterSideEffect.py
+++ b/eos/saveddata/boosterSideEffect.py
@@ -21,6 +21,9 @@ from logbook import Logger
 
 from sqlalchemy.orm import reconstructor
 
+from eos.utils.round import roundToPrec
+
+
 pyfalog = Logger(__name__)
 
 
@@ -56,9 +59,8 @@ class BoosterSideEffect:
     @property
     def name(self):
         return "{0}% {1}".format(
-            self.booster.getModifiedItemAttr(self.attr),
-            self.__effect.getattr('displayName') or self.__effect.name,
-        )
+            roundToPrec(self.booster.getModifiedItemAttr(self.attr), 5),
+            self.__effect.getattr('displayName') or self.__effect.name)
 
     @property
     def attr(self):
diff --git a/eos/utils/round.py b/eos/utils/round.py
new file mode 100644
index 000000000..fe55f2e11
--- /dev/null
+++ b/eos/utils/round.py
@@ -0,0 +1,27 @@
+import math
+
+
+def roundToPrec(val, prec, nsValue=None):
+    """
+    nsValue: custom value which should be used to determine normalization shift
+    """
+    # We're not rounding integers anyway
+    # Also make sure that we do not ask to calculate logarithm of zero
+    if int(val) == val:
+        return int(val)
+    roundFactor = int(prec - math.floor(math.log10(abs(val if nsValue is None else nsValue))) - 1)
+    # But we don't want to round integers
+    if roundFactor < 0:
+        roundFactor = 0
+    # Do actual rounding
+    val = round(val, roundFactor)
+    # Make sure numbers with .0 part designating float don't get through
+    if int(val) == val:
+        val = int(val)
+    return val
+
+
+def roundDec(val, prec):
+    if int(val) == val:
+        return int(val)
+    return round(val, prec)
diff --git a/gui/utils/numberFormatter.py b/gui/utils/numberFormatter.py
index 617e9e18f..15991cc07 100644
--- a/gui/utils/numberFormatter.py
+++ b/gui/utils/numberFormatter.py
@@ -1,5 +1,7 @@
 import math
 
+from eos.utils.round import roundToPrec, roundDec
+
 
 def formatAmount(val, prec=3, lowest=0, highest=0, currency=False, forceSign=False, unitName=None):
     """
@@ -97,29 +99,3 @@ def formatAmount(val, prec=3, lowest=0, highest=0, currency=False, forceSign=Fal
     else:
         result = "{}{} {}{}".format(sign, mantissa, suffix, unitName)
     return result
-
-
-def roundToPrec(val, prec, nsValue=None):
-    """
-    nsValue: custom value which should be used to determine normalization shift
-    """
-    # We're not rounding integers anyway
-    # Also make sure that we do not ask to calculate logarithm of zero
-    if int(val) == val:
-        return int(val)
-    roundFactor = int(prec - math.floor(math.log10(abs(val if nsValue is None else nsValue))) - 1)
-    # But we don't want to round integers
-    if roundFactor < 0:
-        roundFactor = 0
-    # Do actual rounding
-    val = round(val, roundFactor)
-    # Make sure numbers with .0 part designating float don't get through
-    if int(val) == val:
-        val = int(val)
-    return val
-
-
-def roundDec(val, prec):
-    if int(val) == val:
-        return int(val)
-    return round(val, prec)