diff --git a/autotests/folding/highlight.cpp.fold b/autotests/folding/highlight.cpp.fold
--- a/autotests/folding/highlight.cpp.fold
+++ b/autotests/folding/highlight.cpp.fold
@@ -319,6 +319,10 @@
 static float floatQualifier = 0xf.p-1f;
 
 60min; // c++17
+60.min;
+60.3min;
+0x1ffp10min;
+2d; // c++20
 23._f
 23._fd
 2.3_f
diff --git a/autotests/html/highlight.cpp.html b/autotests/html/highlight.cpp.html
--- a/autotests/html/highlight.cpp.html
+++ b/autotests/html/highlight.cpp.html
@@ -325,6 +325,10 @@
 <span style="color:#0057ae;">static</span> <span style="color:#0057ae;">float</span> floatQualifier = <span style="color:#b08000;">0xf.p-1</span><span style="color:#644a9b;font-weight:bold;">f</span>;
 
 <span style="color:#b08000;">60</span><span style="color:#644a9b;font-weight:bold;">min</span>; <span style="color:#898887;">// c++17</span>
+<span style="color:#b08000;">60.</span><span style="color:#644a9b;font-weight:bold;">min</span>;
+<span style="color:#b08000;">60.3</span><span style="color:#644a9b;font-weight:bold;">min</span>;
+<span style="color:#b08000;">0x1ffp10</span><span style="color:#644a9b;font-weight:bold;">min</span>;
+<span style="color:#b08000;">2</span><span style="color:#644a9b;font-weight:bold;">d</span>; <span style="color:#898887;">// c++20</span>
 <span style="color:#b08000;">23.</span><span style="color:#b08000;">_f</span>
 <span style="color:#b08000;">23.</span><span style="color:#b08000;">_fd</span>
 <span style="color:#b08000;">2.3</span><span style="color:#b08000;">_f</span>
diff --git a/autotests/input/highlight.cpp b/autotests/input/highlight.cpp
--- a/autotests/input/highlight.cpp
+++ b/autotests/input/highlight.cpp
@@ -319,6 +319,10 @@
 static float floatQualifier = 0xf.p-1f;
 
 60min; // c++17
+60.min;
+60.3min;
+0x1ffp10min;
+2d; // c++20
 23._f
 23._fd
 2.3_f
diff --git a/autotests/reference/highlight.cpp.ref b/autotests/reference/highlight.cpp.ref
--- a/autotests/reference/highlight.cpp.ref
+++ b/autotests/reference/highlight.cpp.ref
@@ -319,6 +319,10 @@
 <Type Modifiers>static</Type Modifiers><Normal Text> </Normal Text><Data Type>float</Data Type><Normal Text> floatQualifier </Normal Text><Symbol>=</Symbol><Normal Text> </Normal Text><Float>0xf.p-1</Float><Standard Suffix>f</Standard Suffix><Separator Symbol>;</Separator Symbol><br/>
 <dsNormal></dsNormal><br/>
 <Decimal>60</Decimal><Standard Classes>min</Standard Classes><Separator Symbol>;</Separator Symbol><Normal Text> </Normal Text><Comment>// c++17</Comment><br/>
+<Float>60.</Float><Standard Classes>min</Standard Classes><Separator Symbol>;</Separator Symbol><br/>
+<Float>60.3</Float><Standard Classes>min</Standard Classes><Separator Symbol>;</Separator Symbol><br/>
+<Float>0x1ffp10</Float><Standard Classes>min</Standard Classes><Separator Symbol>;</Separator Symbol><br/>
+<Decimal>2</Decimal><Standard Classes>d</Standard Classes><Separator Symbol>;</Separator Symbol><Normal Text> </Normal Text><Comment>// c++20</Comment><br/>
 <Float>23.</Float><UDL Numeric Suffix>_f</UDL Numeric Suffix><br/>
 <Float>23.</Float><UDL Numeric Suffix>_fd</UDL Numeric Suffix><br/>
 <Float>2.3</Float><UDL Numeric Suffix>_f</UDL Numeric Suffix><br/>
diff --git a/data/syntax/isocpp.xml b/data/syntax/isocpp.xml
--- a/data/syntax/isocpp.xml
+++ b/data/syntax/isocpp.xml
@@ -392,12 +392,15 @@
 
       <context name="IntSuffixPattern" attribute="Error" lineEndContext="#pop#pop" fallthrough="true" fallthroughContext="NumericSuffixError">
         <RegExpr attribute="Standard Suffix" context="NumericSuffixError" String="[Uu][Ll]{0,2}|[Ll]{0,2}[Uu]?" />
+        <!-- https://en.cppreference.com/w/cpp/language/user_literal#Standard_library -->
         <RegExpr attribute="Standard Classes" context="NumericSuffixError" String="(?:i[fl]?|min|[mun]?s|[hyd])\b" />
         <DetectChar attribute="Error" context="#pop!NumericUserSuffixPattern" char="_" lookAhead="true" />
       </context>
 
       <context name="FloatSuffix" attribute="Error" lineEndContext="#pop#pop" fallthrough="true" fallthroughContext="NumericSuffixError">
         <AnyChar attribute="Standard Suffix" context="NumericSuffixError" String="fFlL" />
+        <!-- https://en.cppreference.com/w/cpp/language/user_literal#Standard_library -->
+        <RegExpr attribute="Standard Classes" context="NumericSuffixError" String="(?:i[fl]?|min|[mun]?s|h)\b" />
         <DetectChar attribute="Error" context="#pop!NumericUserSuffixPattern" char="_" lookAhead="true" />
       </context>