diff --git a/src/QiParsers.h b/src/QiParsers.h
index 128aea8..1428b6f 100644
--- a/src/QiParsers.h
+++ b/src/QiParsers.h
@@ -2,6 +2,7 @@
 #define FASTREAD_QI_PARSERS
 
 #include "Rinternals.h"
+#include <ctype.h> // tolower
 
 /*
     An STL iterator-based string to floating point number conversion.
@@ -17,10 +18,10 @@ bsd_strtod(const char* begin, const char** endptr, const char decimal_mark) {
   if (begin == *endptr) {
     return NA_REAL;
   }
-  if (*begin == 'n' || *begin == '?') {
-    *endptr = begin;
-    return NA_REAL;
-  }
+  // if (*begin == 'n' || *begin == '?') {
+  //   *endptr = begin;
+  //   return NA_REAL;
+  // }
   int sign = 0, expSign = 0, i;
   double fraction, dblExp;
   const char* p;
@@ -93,6 +94,18 @@ bsd_strtod(const char* begin, const char** endptr, const char decimal_mark) {
   } else if (p != *endptr && *p == '+')
     ++p;
 
+  // Code ported from vroom
+  /* NaN */
+  if (*endptr - p == 3 && tolower(p[0]) == 'n' && tolower(p[1]) == 'a' &&
+      tolower(p[2]) == 'n') {
+    return NAN;
+  }
+  /* Inf */
+  if (*endptr - p == 3 && tolower(p[0]) == 'i' && tolower(p[1]) == 'n' &&
+      tolower(p[2]) == 'f') {
+    return sign == 1 ? -HUGE_VAL : HUGE_VAL;
+  }
+
   /* If we don't have a digit or decimal point something is wrong, so return an
    * NA */
   if (!(isdigit(*p) || *p == decimal_mark)) {
diff --git a/tests/testthat/test-parsing-numeric.R b/tests/testthat/test-parsing-numeric.R
index 0411120..841a6e7 100644
--- a/tests/testthat/test-parsing-numeric.R
+++ b/tests/testthat/test-parsing-numeric.R
@@ -127,3 +127,25 @@ test_that("scientific notation is parsed properly", {
   expect_equal(parse_number("-17E-5-5"), -0.00017)
   expect_equal(parse_number("1.2E-3"), 0.0012)
 })
+
+## Inf NAN NA ref gesistsa/minty#11
+
+test_that("special cases", {
+    ## Inf
+    expect_equal(parse_double("Inf"), Inf)
+    expect_equal(parse_double("INF"), Inf)
+    expect_equal(parse_double("-inf"), -Inf)
+    expect_equal(parse_double("-Inf"), -Inf)
+    expect_equal(parse_double("Infa"), NA_real_)
+    ## NAN
+    expect_equal(parse_double("NAN"), NaN)
+    expect_equal(parse_double("Nan"), NaN)
+    expect_equal(parse_double("-nan"), NaN)
+    expect_equal(parse_double("-nan"), NaN)
+    expect_equal(parse_double("nana"), NA_real_)
+    ## NA
+    expect_equal(parse_double("NA"), NA_real_)
+    expect_equal(parse_double("Naan"), NA_real_) ## in fact..
+    ## integration
+    expect_equal(parse_double(c("NA", "NaN", "Inf", "3.14")), c(NA_real_, NaN, Inf, 3.14))
+})